參數(shù)資料
型號(hào)： SAE81C91
廠(chǎng)商： INFINEON TECHNOLOGIES AG
元件分類(lèi)： 微控制器/微處理器
英文描述： 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PQCC28
封裝： PLASTIC, LCC-28
文件頁(yè)數(shù)： 25/41頁(yè)
文件大小： 521K
代理商： SAE81C91
07Feb95@09:05h Intermediate Version
Semiconductor Group
30
SAE 81C90/91
Port Control Registers
These registers control the parallel ports P0 and P1 which are provided in the SAE 81C90.
The Port Direction Registers PxPDR select each port pin separately for input (PxPDR.n=’0’) or
output (PxPDR.n=’1’). After reset the ports are switched as inputs.
The Port Latch Registers PxLR store the output data for those port pins that are switched to
output.
The Port Pin Registers PxPR provide the current level of the port pins. These registers can only
be read.
In parallel to the standard CMOS structure there are additional internal pullup devices of about
10...200 k
at each port pin.
Note: Registers PxPDR and PxPL may be used for general purpose storage if the ports are not
used.
P1PDR
76543210
Address: 2CH
P1PD.7 P1PD.6 P1PD.5 P1PD.4 P1PD.3 P1PD.2 P1PD.1 P1PD.0
Reset Value: 00H
rw
P0PDR
76543210
Address: 28H
P0PD.7 P0PD.6 P0PD.5 P0PD.4 P0PD.3 P0PD.2 P0PD.1 P0PD.0
Reset Value: 00H
rw
P1LR
76543210
Address: 2EH
P1L.7
P1L.6
P1L.5
P1L.4
P1L.3
P1L.2
P1L.1
P1L.0
Reset Value: 00H
rw
P0LR
76543210
Address: 2AH
P0L.7
P0L.6
P0L.5
P0L.4
P0L.3
P0L.2
P0L.1
P0L.0
Reset Value: 00H
rw
P1PR
76543210
Address: 2DH
P1P.7
P1P.6
P1P.5
P1P.4
P1P.3
P1P.2
P1P.1
P1P.0
Reset Value: 00H
rrrrrrrr
P0PR
76543210
Address: 29H
P0P.7
P0P.6
P0P.5
P0P.4
P0P.3
P0P.2
P0P.1
P0P.0
Reset Value: 00H
rrrrrrrr
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