IBM manual EM78P447NAP and EM78P447NAM Pin Description, EM78P447NAS Pin Description

EM78P447N

8-Bit Microcontroller with OTP ROM

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.
			■ XTAL type: Output terminal for crystal oscillator or external clock input pin.
OSCO	26	I/O	■ 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 are bi-directional I/O pins.
P70~P77	18~25	I/O	■ 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.
			■ XTAL type: Output terminal for crystal oscillator or external clock input pin.
OSCO	26	I/O	■ 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,	I/O	■ P60~P67 are bi-directional I/O pins. These can be pulled -high internally by
	15~17		software control.
			■ P70~P77 are bi-directional I/O pins.
P70~P77	18~25	I/O	■ 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.

4 • Product Specification (V1.1) 03.30.2005

(This specification is subject to change without further notice)