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AT89C5122D-RDRUM Datasheet(PDF) 54 Page - ATMEL Corporation

Part # AT89C5122D-RDRUM
Description  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5122D-RDRUM Datasheet(HTML) 54 Page - ATMEL Corporation

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AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
Port 4
Port 4 has the following functions:
–
Default function: Port 4 is an 6-bit I/O port.
–
Alternate functions: see table below
Port 4 has the following configurations:
–
Default configuration: Pseudo bi-directional “Port51” digital input/output with
internal pull-ups.
–
Alternate configurations: See Table 33.
Table 33.
Port 4 Description
Port 5
Port 5 has the following functions:
–
Default function: Port 5 is an 8-bit I/O port.
–
Alternate function 1: Port 5 is an 8-bit keyboard port KB0 to KB7.
Port 5 has the following configurations:
–
Default configuration: Pseudo bi-directional “Port51” digital input/output with
internal pull-ups.
–
Alternate configuration: see Table 34.
Table 34.
Port 5 Description
Port
Alternate Functions
Configurations
Signal
Description
Mode 1
Mode 2
Mode 3
P4.0
MISO
SPI Master In Slave Out I/O
P4.1
MOSI
SPI Master Out Slave In I/O
P4.2
SCK
SPI clock
P4.3
Push-pull
KB_OUT
Input MPU
P4.4
Push-pull
KB_OUT
Input MPU
P4.5
Push-pull
KB_OUT
Input MPU
Port
Configurations
Mode 1
Mode 2
Mode 3
Comments
P5.0
Push-pull
Input MPU
Input WPU
First cluster
P5.1
Push-pull
Input MPU
Input WPU
P5.2
Push-pull
Input MPU
Input WPU
P5.3
Push-pull
Input WPD
Input WPU
Second cluster
P5.4
Push-pull
Input WPD
Input WPU
P5.5
Push-pull
Input WPD
Input WPU
P5.6
Push-pull
Input WPD
Input WPU
Third cluster
P5.7
Push-pull
Input WPD
Input WPU



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