參數(shù)資料
型號(hào): EM78P5840
廠商: ELAN Microelctronics Corp .
元件分類(lèi): 8位微控制器
英文描述: 8 BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁(yè)數(shù): 28/48頁(yè)
文件大?。?/td> 469K
代理商: EM78P5840
EM78P5840/5841/5842
8-bit Micro-controller
__________________________________________________________________________________________________________________________________________________________________
* This specification is subject to change without notice.
2004/11/10 V2.6
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.9.
Fig.9_1 The circuit of I/O port and I/O control register
Fig.9_2 The input/output circuit of EM785840 input/output ports
M
U
X
0
1
PDRD
PDWR
CLK
C
L
P
R
D
Q
Q
CLK
C
L
P
R
D
Q
Q
PCWR
IOD
PCRD
PORT
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