參數(shù)資料
型號: Q67120-C508
英文描述: IC-SM-8-BIT CPU 12-MHZ
中文描述: 集成電路釤8位CPU的12兆赫
文件頁數(shù): 42/121頁
文件大小: 1000K
代理商: Q67120-C508
Semiconductor Group
6-8
On-Chip Peripheral Components
C501
6.1.2
Alternate Functions
The pins of ports 1 and 3 are multifunctional. They are port pins and also serve to implement special
features as listed in
table 6-4
.
Figure 6-9
shows a functional diagram of a port latch with alternate function. To pass the alternate
function to the output pin and vice versa, however, the gate between the latch and driver circuit must
be open. Thus, to use the alternate input or output functions, the corresponding bit latch in the port
SFR has to contain a one (1); otherwise the pulldown FET is on and the port pin is stuck at 0. After
reset all port latches contain ones (1).
Figure 6-9
Circuitry of Ports 1 and 3
MCS01827
D
CLK
Bit
Latch
Q
Q
Internal
Pull Up
Arrangement
Pin
Read
Latch
to
Latch
Read
Pin
Write
V
CC
Int. Bus
Alternate
Output
Function
Alternate
Input
Function
&
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