AT83C5122_08 ATMEL [ATMEL Corporation], AT83C5122_08 Datasheet - Page 54

• Manufacturer Part Number: AT83C5122_08
• Description: C51 Microcontroller with USB and Smart Card Reader Interfaces
• Manufacturer: ATMEL [ATMEL Corporation]

Port 4
Port 5
54
AT83R5122, AT8xC5122/23
Port 4 has the following functions:
Port 4 has the following configurations:
Table 33. Port 4 Description
Port 5 has the following functions:
Port 5 has the following configurations:
Table 34. Port 5 Description
Port
P5.0
P5.1
P5.2
P5.3
P5.4
P5.5
P5.6
P5.7
Port
P4.0
P4.1
P4.2
P4.3
P4.4
P4.5
–
–
–
–
–
–
–
–
Default function: Port 4 is an 6-bit I/O port.
Alternate functions: see table below
Default configuration: Pseudo bi-directional “Port51” digital input/output with
internal pull-ups.
Alternate configurations: See Table 33.
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.
Default configuration: Pseudo bi-directional “Port51” digital input/output with
internal pull-ups.
Alternate configuration: see Table 34.
Alternate Functions
Signal
MISO
MOSI
SCK
Configurations
Push-pull
Push-pull
Push-pull
Push-pull
Push-pull
Push-pull
Push-pull
Push-pull
Mode 1
Description
SPI Master In Slave Out I/O
SPI Master Out Slave In I/O
SPI clock
Input WPD
Input WPD
Input WPD
Input WPD
Input WPD
Input MPU
Input MPU
Input MPU
Mode 2
Configurations
Push-pull
Push-pull
Push-pull
Mode 1
Input WPU
Input WPU
Input WPU
Input WPU
Input WPU
Input WPU
Input WPU
Input WPU
Mode 3
KB_OUT
KB_OUT
KB_OUT
Mode 2
Comments
First cluster
Second cluster
Third cluster
4202F–SCR–07/2008
Input MPU
Input MPU
Input MPU
Mode 3