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EM78P447N
8-Bit Microcontroller with OTP ROM
Product Specification (V1.1) 03.30.2005
• 5
(This specification is subject to change without further notice)
Table 3 EM78P447NBP and EM78P447NBWM Pin Description
Symbol Pin No. Type Function
VDD 4 - ■ Power supply.
OSCI 29 I
■ XTAL type: Crystal input terminal or external clock input pin.
■ RC type: RC oscillator input pin.
OSCO 28 I/O
■ XTAL type: Output terminal for crystal oscillator or external clock input pin.
■ RC type: Instruction clock output.
■ External clock signal input.
TCC 3 I
■ The real time clock/counter (with Schmitt trigger input pin), must be tied to
VDD or VSS if not in use.
/RESET 30 I
■ Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will keep in reset condition.
P50~P57
8~11,2~1,
32~31
I/O ■ P50~P57 are bi-directional I/O pins.
P60~P67 12~19 I/O
■ P60~P67 are bi-directional I/O pins. These can be pulled -high internally by
software control.
P70~P77 20~27 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 7 I ■ External interrupt pin triggered by falling edge.
VSS 6 - ■ Ground.
NC 5 - ■ No connection.
Table 4 EM78P447NCK and EN78P447NCM Pin Description
Symbol Pin No. Type Function
VDD 3 - ■ Power supply.
OSCI 23 I
■ XTAL type: Crystal input terminal or external clock input pin.
■ RC type: RC oscillator input pin.
OSCO 22 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 24 I
■ Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
P50~P54 6~9,1 I/O ■ P50~P54 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.
P74~P77 18~21 I/O
■ P74~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.
/INT 5 I ■ External interrupt pin triggered by falling edge.
VSS 4 - ■ Ground.
NC 3 - ■ No connection.