ht82a523r Holtek Semiconductor Inc., ht82a523r Datasheet - Page 3

• Manufacturer Part Number: ht82a523r
• Description: Ht82a523r -- Usb 2.0 Full Speed 8-bit Otp Mcu
• Manufacturer: Holtek Semiconductor Inc.

Pin Assignment
Pin Description
Rev. 1.30
PA0/PSYNC,
PA1~PA7
PB0/CLK,
PB1~PB7
PC0/INT
PC1/TMR0
PC2/TMR1
PC3
PC4/SCSB
PC5/SCKB
PC6/SDIB
PC7/SDOB
PD0~PD7
Pin Name
I/O
I/O
I/O
I/O
I/O
(nibble option)
(nibble option)
(nibble option)
(nibble option)
(nibble option)
I/O or PSYNC
CMOS/NMOS
(bit option)
(bit option)
(bit option)
I/O or CLK
Wake-up
Pull-high
Pull-high
Pull-high
Pull-high
Options
wake-up
wake-up
wake-up
Bi-directional 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 controlled
by PAC (PA control register, bit option). Pull-high resistor options:
PA0~PA7, bit option, Wake up options: PA0~PA7 (PA0~PA3 support falling
edge wake-up only, PA4~PA7 support both rising and falling edge wake-up)
The PSYNC is pin-shared with PA0 (dependent on PSYNC option)
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: bit option). CMOS/NMOS options: PB0~PB7.
Wake up options: PB0~PB7 (PB0~PB7 support falling edge wake-up).
The CLK is pin-shared with PB0 (dependent on CLK option) and the fre-
quency of the CLK output is the same as system clock.
Bidirectional I/O lines. Software instructions determine the CMOS output or
Schmitt trigger input with pull-high resistor (determined by pull high options,
nibble option). The INT, TMR0, TMR1 are pin-shared with PC0, PC1, PC2
respectively.
The SCSB is pin-shared with PC4. SCSB is serial interface chip select pin,
master mode is output, slave mode is input.
The SCKB is pin-shared with PC5. SCKB is serial interface serial clock in-
put/output (slave/master, initial is input).
The SDIB is pin-shared with PC6. SDIB is serial interface serial input.
The SDOB is pin-shared with PC7. SDOB is serial interface serial output.
Wake up options: PC0~PC7(PC0~PC7 support falling edge wake-up)
Bidirectional I/O lines. Software instructions determine the CMOS output or
Schmitt trigger input with pull-high resistor (determined by pull-high options:
nibble option).
Wake-up options: PD0~PD7(PD0~PD7 support falling edge wake-up)
3
Description
HT82A523R
May 13, 2008