參數(shù)資料
型號: Z80181
廠商: ZiLOG, Inc.
英文描述: SMART ACCESS CONTROLLER (SAC⑩)
中文描述: 智能門禁控制器(國資委⑩)
文件頁數(shù): 42/74頁
文件大?。?/td> 540K
代理商: Z80181
2-42
Z80181
S
MART
A
CCESS
C
ONTROLLER
SAC
Zilog
DS971800500
PIA Control Registers
PIA1 Data Direction Register (P1DDR, I/O Address E0h),
PIA1 Data Port (P1DP, I/O address E1h), PIA2 Data Direc-
tion Register (P2DDR, I/O Address E2h) and PIA2 Data
Register (P2DP, I/O Address E3h). These four registers are
shown in Figures 51-54. Note that if the CTC/PIA bit in the
System Configuration Register is set to one, the CTC I/O
functions override the PIA1 function, and programming of
P1DDR is ignored.
Figure 51. PIA 1 Data Direction Register
7
6
5
4
3
2
1
0
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
E2H
7
6
5
4
3
2
1
0
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
1 - Input
0 - Output
E0H
Figure 53. PIA 2 Data Direction Register
7
6
5
4
3
2
1
0
PIA 1
I/O Data
E1H
7
6
5
4
3
2
1
0
PIA 2
I/O Data
E3H
Figure 54. PIA 2 Data Register
Figure 52. PIA 1 Data Register
The Data Port is the register to/from the 8-bit parallel port.
At power on Reset, they are initialized to 1.
The Data Direction Register has eight control bits. Individ-
ual bits specify each bit's direction. When the bit is set to
a "1", the bit becomes an input, otherwise it is an output. On
reset, these registers are initialized to 1, resulting in all lines
being inputs.
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