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AT89C5122D-RDRUM 数据表(PDF) 59 Page - ATMEL Corporation

部件名 AT89C5122D-RDRUM
功能描述  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT89C5122D-RDRUM 数据表(HTML) 59 Page - ATMEL Corporation

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59
AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
Registers
Reset Value = 0000 0x00b
Reset Value = 00xx 0xxxb
Table 36.
Port Mode Register 0 - PMOD0 (91h) for AT8xC5122
7
654
3
2
1
0
P3C1
P3C0
P2C1
P2C0
CPRESRES
-
P0C1
P0C0
Bit Number
Bit Mnemonic Description
7 - 6
P3C1-P3C0
Port 3 Configuration bits (Applicable to P3.0, P3.1, P3.3, P3.4 only)
00
Quasi bi-directional
01
Push-pull
10
Output Low Speed
11
Input with weak pull-up
5-4
P2C1-P2C0
Port 2 Configuration bits
00
Quasi bi-directional
01
Push-pull
10
Output Low Speed
11
Input with weak pull-down
3CPRESRES
Card Presence Pull-up resistor
Cleared to connect the internal 100K pull-up
Set to disconnect the internal pull-up
2-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
1-0
P0C1-P0C0
Port 0 Configuration bits
00
C51 Standard P0
01
Reserved
10
Output Low Speed
11
Push-pull
Table 37.
Port Mode Register 0 - PMOD0 (91h) for AT83C5123
7
654
3
2
1
0
P3C1
P3C0
-
-
CPRESRES
-
-
-
Bit Number
Bit Mnemonic Description
7 - 6
P3C1-P3C0
Port 3 Configuration bits (Applicable to P3.0, P3.1, P3.3, P3.4 only)
00
Quasi bi-directional
01
Push-pull
10
Output Low Speed
11
Input with weak pull-up
5-4
Reserved
The value read from these bits are indeterminate. Do not set these bit.
3CPRESRES
Card Presence Pull-up resistor
Cleared to connect the internal 100K pull-up
Set to disconnect the internal pull-up
2-0
-
Reserved
The value read from these bits are indeterminate. Do not set these bit.



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