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HT48RB8
8-Bit USB Type OTP MCU
Rev. 1.30
1
February 10, 2003
General Description
This device is an 8-bit high performance RISC-like
microcontroller designed for USB product applications.
It is particularly suitable for use in products such as
mice, keyboards and joystick. A HALT feature is in-
cluded to reduce power consumption.
Features
Operating voltage:
f
SYS
=6M/12MHz: 4.4V~5.5V
Low voltage reset function
32 bidirectional I/O lines (max.)
8-bit programmable timer/event counter with over-
flow interrupt
16-bit programmable timer/event counter and over-
flow interrupts
Crystal oscillator (6MHz or 12MHz)
Watchdog Timer
6 channels 8-bit A/D converter
USB1.1 low speed function
4 endpoints supported (endpoint 0 included)
4096
15 program memory ROM
160
8 data memory RAM
HALT function and wake-up feature reduce power
consumption
8-level subroutine nesting
Up to 0.33
ms instruction cycle with 12MHz system
clock at V
DD
=5V
Bit manipulation instruction
15-bit table read instruction
63 powerful instructions
All instructions in one or two machine cycles
28-pin SOP, 48-pin SSOP package
Block Diagram
HT48RB8
Rev. 1.30
2
February 10, 2003
O S C 2
O S C 1
R E S
V D D
M U X
T M R 0 C
T M R 0
V S S
P r o g r a m
R O M
P r o g r a m
C o u n t e r
I n t e r r u p t
C i r c u i t
S T A C K
I N T C
D A T A
M e m o r y
I n s t r u c t i o n
R e g i s t e r
M
U
X
I n s t r u c t i o n
D e c o d e r
S T A T U S
A L U
S h i f t e r
T i m i n g
G e n e r a t o r
A C C
M
U
X
M P
S Y S C L K / 4
W D T S
W D T
W D T O S C
W D T P r e s c a l e r
M
U
X
E N / D I S
P D C
P O R T D
P D 0 ~ P D 7
P B C
P O R T B
P B 0 / A N 0 ~ P B 5 / A N 5
P B 6 / V R L
P B 7 / V R H
P B
P A C
P O R T A
P A 0 ~ P A 5
P A 6 / T M R 0
P A 7 / T M R 1
P A
P D
P C
P O R T C
P C 0 ~ P C 7
P C C
T M R 1 C
T M R 1
M
U
X
P A 7 / T M R 1
f
S Y S
/ 4
f
S Y S
/ 4
P A 6 / T M R 0
A / D C o n v e r t e r
U S B 1 . 1
P S 2
B P
U S B D + / C L K U S B D - / D A T A
V 3 3 O
P A 6
P A 7
Pin Assignment
Pin Description
Pin Name
I/O
ROM Code
Option
Description
PA0~PA5
PA6/TMR0
PA7/TMR1
I/O
Pull-low
Pull-high
Wake-up
CMOS/NMOS/PMOS
Bidirectional 8-bit input/output port. Each bit can be configured as a
wake-up input by ROM code option. The input or output mode is con-
trolled by PAC (PA control register).
Pull-high resistor options: PA0~PA7
Pull-low resistor options: PA0~PA5
CMOS/NMOS/PMOS options: PA0~PA7
Wake up options: PA0~PA7
PA6 and PA7 are pin-shared with TMR0 and TMR1 input, respectively.
PA0~PA5 can be used as USB mouse X1, X2, Y1, Y2, Z1, Z2 input for
mouse hardware wake-up function
PA6, PA7 can be used as USB mouse button input for mouse hardware
wake-up function
PB0/AN0
PB1/AN1
PB2/AN2
PB3/AN3
PB4/AN4
PB5/AN5
PB6/VRL
PB7/VRH
I/O
Pull-high
Analog input
Bidirectional 8-bit input/output port. Software instructions determine the
CMOS output or Schmitt trigger input with pull-high resistor (determined
by pull-high options).
The PB can be used as analog input of the analog to digital converter
(determined by options).
PB6, PB7 can be used as USB mouse button input for mouse Hardware
wake-up function
PD0~PD7
I/O
Pull-high
Bidirectional I/O lines. Software instructions determine the CMOS out-
put or Schmitt trigger input with pull-high resistor (determined by 1-bit
pull-high option).
PD4 can be used as USB mouse button input for mouse hardware
wake-up function
HT48RB8
Rev. 1.30
3
February 10, 2003
4 8
4 7
4 6
4 5
4 4
4 3
4 2
4 1
4 0
3 9
3 8
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0
2 1
2 2
2 3
2 4
H T 4 8 R B 8
4 8 S S O P - A
P C 6
P C 7
P A 4
P A 5
P A 6 / T M R 0
P A 7 / T M R 1
N C
N C
N C
N C
P D 3
P D 2
P D 1
P D 0
O S C 1
O S C 2
R E S
V S S
P B 7 / V R H
P B 6 / V R L
P B 5 / A N 5
P B 4 / A N 4
P B 3 / A N 3
P B 2 / A N 2
P C 5
P C 4
P A 3
P A 2
P A 1
P A 0
P C 0
P C 1
P C 2
P C 3
N C
N C
N C
N C
P D 4
P D 5
P D 6
P D 7
V D D
V 3 3 O
U S B D +
U S B D -
P B 0 / A N 0
P B 1 / A N 1
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
1 9
1 8
1 7
1 6
1 5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
P C 2
P C 0
P A 0
P A 1
P A 2
P A 3
P C 4
P A 4
P A 5
P A 6 / T M R 0
P A 7 / T M R 1
O S C 1
O S C 2
R E S
P C 3
V D D
V 3 3 O
U S B D +
U S B D -
P B 0 / A N 0
P B 1 / A N 1
P B 2 / A N 2
P B 3 / A N 3
P B 4 / A N 4
P B 5 / A N 5
P B 6 / V R L
P B 7 / V R H
V S S
H T 4 8 R B 8
2 8 S O P - A
Pin Name
I/O
ROM Code
Option
Description
VSS
Negative power supply, ground
PC0~PC7
I/O
Pull-high
Bidirectional I/O lines. Software instructions determine the CMOS out-
put or Schmitt trigger input with pull-high resistor (determined by
pull-high options).
PC0 can be used as USB mouse IRPT control pin for mouse hardware
wake-up function
RES
I
Schmitt trigger reset input. Active low
VDD
Positive power supply
V33O
O
3.3V regulator output
USBD+
I/O
USBD+ I/O line
USBD-
I/O
USBD-
OSC1
OSC2
I
O
OSC1, OSC2 are connected to an 6MHz or 12MHz Crystal/resonator
(determined by software instructions) for the internal system clock.
Absolute Maximum Ratings
Supply Voltage ...........................V
SS
-0.3V to V
SS
+6.0V
Storage Temperature ............................
-50C to 125C
Input Voltage..............................V
SS
-0.3V to V
DD
+0.3V
Operating Temperature...........................
-40C to 85C
Note: These are stress ratings only. Stresses exceeding the range specified under
Absolute Maximum Ratings may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
D.C. Characteristics
Ta=25
C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DD
Operating Voltage
f
SYS
=6MHz
4.4
5.5
V
f
SYS
=12MHz
4.4
5.5
V
I
DD1
Operating Current (6MHz Crystal)
5V
No load, f
SYS
=6MHz
6.5
12
mA
I
DD2
Operating Current (12MHz Crystal)
5V
No load, f
SYS
=12MHz
7.5
16
mA
I
STB1
Standby Current (WDT Enabled)
5V
No load, system HALT,
USB suspend
250
mA
I
STB2
Standby Current (WDT Disabled)
5V
No load, system HALT,
USB suspend
230
mA
V
IL1
Input Low Voltage for I/O Ports
0
0.3V
DD
V
V
IH1
Input High Voltage for I/O Ports
0.7V
DD
V
DD
V
V
IL2
Input Low Voltage (RES)
5V
0
0.4V
DD
V
V
IH2
Input High Voltage (RES)
5V
0.9V
DD
V
DD
V
I
OL1
I/O Port Sink Current for PB, PC1~PC7, PD
5V
V
OL
=3.4V
12
17
mA
I
OL2
I/O Port Sink Current for PB, PC1~PC7, PD
5V
V
OL
=0.4V
2
4
mA
I
OL3
I/O Port Sink Current for PA
5V
V
OL
=0.4V
5
10
mA
I
OL4
I/O Port Sink Current for PC0
5V
V
OL
=0.4V
10
25
mA
HT48RB8
Rev. 1.30
4
February 10, 2003
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
I
OH1
I/O Port Source Current for PC0
5V
V
OH
=3.4V
-8
-16
mA
I
OH2
I/O Port Source Current for PA, PB,
PC1~PC7, PD
5V
V
OH
=3.4V
-2
-5
mA
R
PH
Pull-high Resistance for PA, PB, PC, PD
5V
25
50
80
k
W
R
PL
Pull-low Resistance for PA1~PA5
5V
15
30
45
k
W
V
LVR
Low Voltage Reset
3
3.4
4.0
V
V
V33O
3.3V Regulator Output
5V
I
V33O
=
-5mA
3.0
3.3
3.6
V
E
A/D
A/D Conversion Error
5V
Total error
1
2
LSB
A.C. Characteristics
Ta=25
C
Symbol
Parameter
Test Conditions
Min.
Typ. Max.
Unit
V
DD
Conditions
f
SYS
System Clock (Crystal OSC)
5V
6
12
MHz
f
TIMER
Timer I/P Frequency (TMR0/TMR1)
5V
0
12
MHz
t
WDTOSC
Watchdog Oscillator Period
5V
15
31
70
ms
t
WDT1
Watchdog Time-out Period (WDT OSC)
5V
Without WDT prescaler
4
8
16
ms
t
WDT2
Watchdog Time-out Period (System Clock)
Without WDT prescaler
1024
t
SYS
t
RES
External Reset Low Pulse Width
1
ms
t
SST
System Start-up Timer Period
Wake-up from HALT
1024
t
SYS
Power-up, Watchdog
Time-out from normal
1024
t
WDTOSC
t
INT
Interrupt Pulse Width
1
ms
t
ADC
A/D Conversion Time
64
t
A/D
Note: t
A/D
=
1
f
A /D
, f
A/D
=A/D clock source frequencies (6MHz, 3MHz, 1.5MHz, 0.75MHz)
HT48RB8
Rev. 1.30
5
February 10, 2003
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