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EM78P447NAM Datasheet(PDF) 17 Page - ELAN Microelectronics Corp

Part # EM78P447NAM
Description  8-BIT MICRO-CONTROLLER
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Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM78P447NAM Datasheet(HTML) 17 Page - ELAN Microelectronics Corp

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EM78P447N
OTP ROM
4.4 I/O Ports
The I/O registers, Port 5, Port 6, and Port 7, are bi-directional tri-state I/O ports. The functions of
Pull-high, R-option, and Open-drain can be performed internally by CONT and IOCE respectively.
There is input status change wake-up function on Port 6, P74, and P75. Each I/O pin can be defined as
"input" or "output" pin by the I/O control register (IOC5 ~ IOC7). The I/O registers and I/O control
registers are both readable and writable. The I/O interface circuits for Port 5, Port 6, and Port 7 are
shown in Figures. 7(a) and (b) respectively.
PDRD
Q
Q
CLK
D
PCWR
PDWR
Q
Q
CLK
D
PR
CL
PORT
0
1
M
U
X
IOD
PCRD
PR
CL
Fig. 7 (a) The I/O Port and I/O Control Register Circuit
PDRD
Q
Q
CLK
D
PCWR
PDWR
Q
Q
CLK
D
0
1
M
U
X
IOD
ROC
VCC
Weakly
Pull- up
PORT
Rex*
*The Rex is 430K ohm external resistor
PCRD
PR
CL
PR
CL
This specification is subject to change without prior notice.
10.21.2004 (V1.0)
17
Fig.7(b) The I/O Port with R-Option (P70, P71) Circuit


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