ELANsat Tech EM78P156N Fig. 6 The Circuit of I/O Port and I/O Control Register for Port, Fig. 7(a) The Circuit of I/O Port and I/O Control Register for P60 (/INT)

EM78P156N

OTP ROM

R-option function is used, it is recommended that P50~P51 are used as output pins. When R-option is in enable state, P50~P51 must be programmed as input pins. Under R-option mode, the current/power consumption by Rex should be taken into the consideration to promote energy conservation.

The I/O registers and I/O control registers are both readable and writable. The I/O interface circuits for Port 5 and Port 6 are shown in the following Figures 6, 7(a), 7(b), and Figure 8.

	P C R D
	Q	P	D
		R
	_	C C LK		PC W R
	Q	L
P O R T	Q	P	D	IO D
		R
	_	C	C L K	PD W R
	Q	L
				P D R D

0M U

1X

NOTE: Pull-down is not shown in the figure.

Fig. 6 The Circuit of I/O Port and I/O Control Register for Port 5

P C R D

					Q	P	D
						R
					_	C L K		P C W R
					Q	C
						L
P 6 0	/ I N T					P		I O D
P O R T					Q		D
						R
					_	C L K		P D W R
B i t 6 o f I O C E					Q C
						L
D	P	Q	0	M
	R		1
C L K		_		U
	C	Q		X
	L
								T 1 0
								P D R D
				D	P	Q
					R
				C L K		_
					C	Q
					L
			I N T

NOTE: Pull-high (down) and Open-drain are not shown in the figure.

Fig. 7(a) The Circuit of I/O Port and I/O Control Register for P60 (/INT)

This specification is subject to change without prior notice. 17 07.29.2004 (V1.2)