參數(shù)資料
型號(hào)： EM78P447SAM
廠商： ELAN Microelctronics Corp .
英文描述： 8-BIT MICRO-CONTROLLER
中文描述： 8位微控制器
文件頁(yè)數(shù)： 17/55頁(yè)
文件大小： 1730K
代理商： EM78P447SAM
EM78P447S
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
CL
D
PR
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
CL
D
0
1
M
U
X
IOD
ROC
VCC
Weakly
Pullup
PORT
Rex*
*The Rex is 430K ohm external resistor
PCRD
PR
CL
PR
Fig.7(b) The I/O Port with R-Option (P70, P71) Circuit
This specification is subject to change without prior notice.
06.25.2003 (V1.1)
17
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