em78p5830aa ELAN Microelectronics Corp, em78p5830aa Datasheet - Page 29

• Manufacturer Part Number: em78p5830aa
• Description: 8-bit Micro-controller 8-bit Micro-controller
• Manufacturer: ELAN Microelectronics Corp

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* This specification is subject to be changed without notice.
VII.4 I/O Port
The I/O registers are bi-directional tri-state I/O ports. The I/O ports can be defined as "input" or "output" pins by
the I/O control registers under program control. The I/O data registers and I/O control registers are both readable
and writable. The I/O interface circuit is shown in Fig.11.
PORT
Fig.11_2 The input/output circuit of EM785830AA input/output ports
Fig.11_1 The circuit of I/O port and I/O control register
0
1
M
U
X
Q
Q
Q
Q
27
PCRD
R
P
C
R
L
P
C
L
CLK
CLK
D
D
VDD
pull
high
PCWR
PDWR
PDRD
VDD
120
ohm
VDD
8-bit Micro-controller
12/1/2004 V1.6
EM785830AA
PIN
IOD