EM78F651N
8-Bit Microcontroller
4
Pin Description
Table 1 EM78F651NAP, EM78F651NAM
Symbol
P54~P55
P60~P67
P77
OSCI
Pin No.
13, 14
4~11
1
14
Type
I/O
I/O
I/O
I
Function
Bidirectional 2-bit input/output pins
Bidirectional 8-bit input/output pins. These can be pulled-high or can
be open drain by software programming. P60~63 can also be pulled
down by software.
P77 is an open drain I/O pin.
Crystal type: Crystal input terminal or external clock input pin
ERC type: RC oscillator input pin
Crystal type: Output terminal for crystal oscillator or external clock
input pin.
RC type: Instruction clock output.
External clock signal input.
Real time clock/counter (with Schmitt Trigger input pin) must be tied
to VDD or VSS if not in use.
External interrupt pin triggered by a falling edge.
Input pin with Schmitt Trigger. If this pin remains at logic low, the
controller will also remain in reset condition.
Power supply
Ground
OSCO
13
I/O
TCC
/INT
/RESET
VDD
VSS
1
4
2
12
3
I
I
I
−
−
Table 2 EM78F651NBP, EM78F651NBM
Symbol
P50, P53
P54~P55
P60~P67
P77
OSCI
Pin No.
16, 1,
14, 15
5~12
2
15
Type
I/O
I/O
I/O
I
Function
Bidirectional 4-bit input/output pins
50, P53 can be pulled-down by software.
Bidirectional 8-bit input/output pins. These can be pulled-high or can
be open drain by software programming. P60~63 can also be pulled
down by software.
P77 is an open drain I/O pin.
Crystal type: Crystal input terminal or external clock input pin
ERC type: RC oscillator input pin
Crystal type: Output terminal for crystal oscillator or external clock
input pin.
RC type: Instruction clock output.
External clock signal input.
The real time clock/counter (with Schmitt Trigger input pin) must be
tied to VDD or VSS if not in use.
External interrupt pin triggered by a falling edge.
Input pin with Schmitt Trigger. If this pin remains at logic low, the
controller will also remain in reset condition.
Power supply
Ground
OSCO
14
I/O
TCC
/INT
/RESET
VDD
VSS
2
5
3
13
4
I
I
I
-
-
Product Specification (V1.1) 10.20.2006
(This specification is subject to change without further notice)
•
3
EMC [ ELAN MICROELECTRONICS CORP ]
