Pin Description - IBM EM78P312N Specification

EM78P312N
8-Bit Microcontroller
4

Pin Description

Table 1
Symbol Pin No.
VDD
28
OSCI
2
OSCO
1
/RESET
27
P60~P67
19~26
P70~P73
15~18
P80~P81
12~13
P90~P97
4~11
VSS
14
NC
3
OTP Programming Pins
VPP
27
ACLK
1
DATAIN
25
DINCK
26
PGMB
24
OEB
23
2 •
Type
−
Power supply
Crystal type: Crystal input terminal
I
RC type: RC oscillator input pin
Crystal type: Output terminal for crystal oscillator
I/O RC type: Instruction clock output
External clock signal input
Input pin with Schmitt Trigger. If this pin remains at logic low, the
I
controller will also remain in reset condition.
8-bit bidiectional input/output pins.
P60 can be used as external Interrupt 0 (/INT0).
P61 can be used as external Interrupt 1 (INT1).
I/O P62 can be used as 16-bit Timer/Counter 2 (TC2).
P63 can be used as divider output (/TONE).
P64 slave mode enable (/SS).
P60 ~ P63 can be used as pull-high or pull-low pins.
8-bit bidiectional input/output pins.
P70 can be used as SPI serial clock input/output (/SCK)
P71 can be used as SPI serial data input (SI) or UART data receive
input (RX)
I/O
P72 can be used as SPI serial data output (SO) or UART data
transmit output (TX)
P73 can be used as Sleep mode release input (/SLEEP) or external
interrupt Input 5 (/INT5)
P70 ~ P73 can be used as pull-high or pull-low pins
2-bit bidiectional input/output pins.
P80 can be used as 8-bit Timer/Counter 3 (TC3) or external
Interrupt Input 3 (INT3).
I/O
P81 can be used as 8-bit Timer/Counter 4 (TC4) or programmable
divider output (PDO).
P80 ~ P81 can be used as pull-high or pull-low pins.
8-bit bidiectional input/output pins.
I/O P90~P97 can be used as 8 channel 10-bit resolution A/D converter.
P97 can be used as AD reference power supply input (VREF).
−
Ground
− No connection
I Programming voltage input
I CLK for OTP memory address increment
I/O ROM code series input and series output pin
I ROM code input clock
I Program write enable pin. Active low.
I Output enable pin. Active low.
(This specification is subject to change without further notice)
Function
Product Specification (V1.0) 10.03.2006