IBM manual Function Description, EM78P447NDK and EM78P447NDM Pin Description

EM78P447N

8-Bit Microcontroller with OTP ROM

Table 5 EM78P447NDK and EM78P447NDM Pin Description

Symbol	Pin No.	Type	Function
VDD	3	-	■ Power supply.
OSCI	19	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	18	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	20	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	10	I/O	■ P60 are bi-directional I/O pins. This can be pulled-high internally by
			software control.
			■ P74~P77 are bi-directional I/O pins.
P71~P77	11~17	I/O	■ P74~P75 can be pulled-high internally by software control.
			■ P76~P77 can have open-drain output by software control.
			■ 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.

4 FUNCTION DESCRIPTION

O S C I O S C O /R E S E T		T C C	/IN T
	W D T T im e r				P C	S T A C K 1
O s c illa to r/T im in g
						S T A C K 2
C o n tro l
						S T A C K 3
P re s c a le
r				R O M		S T A C K 4
W D T						S T A C K 5
T im -e o u t		In te rru p t
				In s tru c tio n
		C o n tro l
R 1 (T C C )				R e g is te r
						A L U
S le e p	R A M			In s tru c tio n
				D e c o d e r
&					R 3
W a k e						A C C
C o n tro l	R 4
			D A T A & C O N T R O L B U S
IO C 5		IO C 6			IO C 7
R 5		R6			R 7
PPPPPPPP		PPPPPPPP			PPPPPPPP
55555555		66666666			77777777
0123 4567		0123 4567			0123 4567

Fig. 2 Functional Block Diagram

6 • Product Specification (V1.1) 03.30.2005

(This specification is subject to change without further notice)