參數(shù)資料
型號(hào)： MA28155
廠商： Dynex Semiconductor Ltd.
英文描述： Radiation Hard Programmable Peripheral Interface
中文描述： 輻射硬可編程外設(shè)接口
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 214K
代理商： MA28155
MA28155
14/20
Reading Port C Status.
In Mode 0 Port C transfers data from or to the peripheral
device, When the MA28155 is programmed to function in
Modes 1 or 2 Port C generates or accepts handshaking signals
with the peripheral device, Reading the contents of Port C
allows the programmer to test or verify the status of each
peripheral device and change the program flow accordingly.
There is no special instruction to read the Status
Information from Port C. A normal read operation of Port C is
executed to perform this function.
Special Mode Combination Considerations.
There are several combinations of modes when not all of
the bits in port C are used for control or status. The remaining
bits can be used as follows:
If programmmed as inputs-
All input lines can be accessed during normal port C
read.
If programmed as outputs
Bits in C upper (PC7-PC4) must be individually
accessed using a bit set/reset function.
Bits in C lower (PC3-PC0) can be accessed using the bit
set/reset function or bits PC2-PC0 may also be accessed as a
trio by writing into port C.
Figure 18b: Mode 1 Output Configuration
Figure 18c: Mode 2
Figure 18a: Mode 1 Input Configuration
OBF
A
N
OBF
B
N
OBF
A
N
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