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EM78P312N
8-Bit Microcontroller
2 •
Product Specification (V1.0) 10.03.2006
(This specification is subject to change without further notice)
4 Pin Description
Table 1
Symbol Pin No. Type Function
VDD
28 − Power supply
OSCI
2 I
Crystal type: Crystal input terminal
RC type: RC oscillator input pin
OSCO
1 I/O
Crystal type: Output terminal for crystal oscillator
RC type: Instruction clock output
External clock signal input
/RESET
27 I
Input pin with Schmitt Trigger. If this pin remains at logic low, the
controller will also remain in reset condition.
P60~P67
19~26 I/O
8-bit bidiectional input/output pins.
P60 can be used as external Interrupt 0 (/INT0).
P61 can be used as external Interrupt 1 (INT1).
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.
P70~P73
15~18 I/O
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)
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
P80~P81
12~13 I/O
2-bit bidiectional input/output pins.
P80 can be used as 8-bit Timer/Counter 3 (TC3) or external
Interrupt Input 3 (INT3).
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.
P90~P97
4~11 I/O
8-bit bidiectional input/output pins.
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).
VSS
14 − Ground
NC
3 − No connection
OTP Programming Pins
VPP
27 I Programming voltage input
ACLK
1 I CLK for OTP memory address increment
DATAIN
25 I/O ROM code series input and series output pin
DINCK
26 I ROM code input clock
PGMB
24 I Program write enable pin. Active low.
OEB
23 I Output enable pin. Active low.