EM78P159N
8-Bit Microcontrollerwith OTP ROM
3.1 EM78P159NP and EM78P159NM Pin Description
Symbol
VDD
Pin No. Type
Function
14
-
■ Power supply
■ General-purpose I/O pin
P56/OSCI
16
I/O
■ XTAL type: Crystal input terminal or external clock input pin
■ ERC type: RC oscillator input pin
■ General-purpose I/O pin
■ XTAL type: Output terminal for crystal oscillator or external clock input pin
■ RC type: Instruction clock output
P55/OSCO
15
I/O
■ External clock signal input
■ General-purpose I/O pin
P54/TCC
/RESET
3
4
I/O
I
■ The real time clock/counter (with Schmitt trigger input pin), must be tied to
VDD or VSS if not in use.
■ Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
■ P50 ~ P53 are bi-directional I/O pins.
17, 18,
1, 2
P50 ~ P53
I/O
■ P50 and P51 can also be defined as the R-option pins
■ P50 ~ P53 can be pulled-down by software
■ P60 ~ P67 are bi-directional I/O pins.
P60 ~ P67
6 ~ 13
I/O
■ These can be pulled-high or can be open-drain by software programming
■ P60 ~ P63 can also be pulled-down by software
/INT
VSS
6
5
I
■ External interrupt pin triggered by falling edge
■ Ground
-
3-2 EM78P159NAS Pin Description
Symbol
Pin No. Type
Function
VDD
15
-
■ Power supply.
■ General-purpose I/O pin
P56/OSCI
17
I/O
■ XTAL type: Crystal input terminal or external clock input pin
■ ERC type: RC oscillator input pin
■ General-purpose I/O pin
■ XTAL type: Output terminal for crystal oscillator or external clock input pin
■ RC type: Instruction clock output
P55/OSCO
16
I/O
■ External clock signal input
■ General-purpose I/O pin
P54/TCC
/RESET
P50~P53
4
5
I/O
I
■ The real time clock/counter (with Schmitt trigger input pin), must be tied to
VDD or VSS if not in use.
■ Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
■ P50 ~ P53 are bi-directional I/O pins
18, 19,
2, 3
I/O
■ P50 and P51 can also be defined as the R-option pins
■ P50 ~ P53 can be pulled-down by software
■ P60 ~ P67 are bi-directional I/O pins.
P60~P67
7~14
I/O
■ These can be pulled-high or can be open-drain by software programming
■ P60 ~ P63 can also be pulled-down by software
/INT
VSS
7
6
I
■ External interrupt pin triggered by falling edge
■ Ground
-
4 •
Product Specification (V1.0) 03.10.2006
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
