EM78156E
8-Bit Microcontroller with MASK ROM
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),
7(C)and Figure 8.
PCRD
P
Q
D
R
PCWR
CLK
_
Q
C
L
P
IOD
PORT
Q
D
R
PDWR
CLK
_
Q
C
L
PDRD
0
1
M
U
X
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
P
Q
_
Q
D
R
P C W
R
R
C L K
C
L
P 6 0 / I N T
P O R T
I O
D
P
Q
_
Q
D
R
P D W
C L K
C
L
B i t
6 o f I O C E
0
1
P
D
Q
M
U
X
R
_
Q
C L K
C
L
T 1 0
P D R D
P
D
Q
R
C L K
_
Q
C
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)
Product Specification (V1.3) 07.29.2004
• 13
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
