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EM78P447N
8-Bit Microcontroller with OTP ROM
4 •
Product Specification (V1.1) 03.30.2005
(This specification is subject to change without further notice)
Table 1 EM78P447NAP and EM78P447NAM Pin Description
Symbol Pin No. Type Function
VDD 2 - ■ Power supply.
OSCI 27 I
■ XTAL type: Crystal input terminal or external clock input pin.
■ RC type: RC oscillator input pin.
OSCO 26 I/O
■ XTAL type: Output terminal for crystal oscillator or external clock input pin.
■ RC type: Instruction clock output.
■ External clock signal input.
TCC 1 I
■ The real time clock/counter (with Schmitt trigger input pin) must be tied to
VDD or VSS if not in use.
/RESET 28 I
■ Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
P50~P53 6~9 I/O ■ P50~P53 are bi-directional I/O pins.
P60~P67 10~17 I/O
■ P60~P67 are bi-directional I/O pins. These can be pulled-high internally by
software control.
P70~P77 18~25 I/O
■ P70~P77 are bi-directional I/O pins.
■ P74~P75 can be pulled-high internally by software control.
■ P76~P77 can have open-drain output by software control.
■ P70 and P71 can also be defined as the R-option pins.
/INT 5 I ■ External interrupt pin triggered by falling edge.
VSS 4 - ■ Ground.
NC 3 - ■ No connection.
Table 2 EM78P447NAS Pin Description
Symbol Pin No. Type Function
VDD 3 - ■ Power supply.
OSCI 27 I
■ XTAL type: Crystal input terminal or external clock input pin.
■ RC type: RC oscillator input pin.
OSCO 26 I/O
■ XTAL type: Output terminal for crystal oscillator or external clock input pin.
■ RC type: Instruction clock output.
■ External clock signal input.
TCC 2 I
■ The real time clock/counter (with Schmitt trigger input pin) must be tied to
VDD or VSS if not in use.
/RESET 28 I
■ Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
P50~P53 5~8 I/O ■ P50~P53 are bi-directional I/O pins.
P60~P67
9~13,
15~17
I/O
■ P60~P67 are bi-directional I/O pins. These can be pulled -high internally by
software control.
P70~P77 18~25 I/O
■ P70~P77 are bi-directional I/O pins.
■ P74~P75 can be pulled -high internally by software control.
■ P76~P77 can have open-drain output by software control.
■ P70 and P71 can also be defined as the R-option pins.
/INT 4 I ■ External interrupt pin triggered by falling edge.
VSS 1,14 - ■ Ground.