TOSHIBA CORPORATION
9/12
TMP90CH02/H03
4.4 Pin Names and Functions
The names of input/output pins and their functions are summarized in Table 2.2.
Table 2.2 Pin Names and Functions (1/1)
Pin Name
No. of Pins
I/O 3 states
Function
P00 ~ P07
/D0 ~ D7
8
I/O
Port 0: 8-bit I/O port that allows selection of input/output on byte basis
3 states
Data Bus: Also functions as 8-bit bidirectional data bus for external memory
P10 ~ P17
/A0 ~ A7
8
I/O
Port 1: 8-bit I/O port that allows selection on byte basis
Output
Addrress Bus: The lower 8 bits address bus for external memory
P20 ~ P27
/A8 ~ A 15
8
I/O
Port 2: 8-bit I/O port that allows selection on byte basis
Output
Addrress Bus: The uppper 8 bits address bus for external memory
P31
/RxD
1
Input
Port 31: 1-bit input port
Receives Serial Data
P32
/TxD
/RTS
/SCLK
1
Output
Port 32: 1-bit output port
Serial clock output
P33
/TxD
1
Output
Port 33: 1-bit output port
Transmits Serial Data
P35
/RD
1
Output
Port 35: 1-bit output port
Read: Generates strobe signal for reading external memory
P36
/WR
1
Output
Port 36: 1-bit output port
Writes: Generates strobe signal for writing external memory
P37
/WAIT
TO1
1
Input
Port 37: 1-bit input port
Wait: Input pin for connecting slow speed memory or peripheral LSI
Output
Timer output 1: Output of Timer 0 or 1
P80
/INTO
1
Input
Port 80: 1-bit input port
Interrupt request pin 0: Interrupt request pin (Level/rising edge is programmable)
P81
/INT1
/TI2
1
Input
Port 81: 1-bit input port
Interrupt request pin 1: Interrupt request pin (Rising/falling edge is programmable)
Timer input 2: Counter/capture trigger signal for Timer 2
NMI
1
Input
Non-maskable interrupt request pin: Falling edge interrupt request pin
CLK
1
Output
Clock output: Generates clock pulse at 1/4 frequency of clock oscillation. It is pulled up
internally during resetting.
EA
1
Input
External access: Connects with GND pin in the TMP90CH02 using internal ROM, and
with GND pin in the TMP90CH03 with no internal ROM.
RESET
1
Input
Reset: Initializes the TMP 90CH02/CH03. (Built-in pull-up resistor)
X1/X2
2
Input/
Output
Pin for quartz crystal or ceramic resonator (1 ~ 16MHz)
V
CC
1
–
Power supply (+5V)
V
SS
(GND)
1
–
Ground (0V)
