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I/O Ports
15-25
15.6.2 Register Descriptions
Port 4 is a general-purpose input/output port that is also used for serial interface input/output signals SBI1,
SBO1, SBT1, SBI0, SBO0, and SBT0; the DRAM CAS signals (for 2CAS) DCAS1 and DCAS0; and the DRAM
write signal (for 2CAS) DWE.
Each register for port 4 is described below.
Port 4 output register
Register symbol: P4OUT
Address: x'36008008
Purpose: This register sets the data to be output on port 4.
Bit No. 7 6 543210
Bit name - - P45O P44O P43O P42O P41O P40O
Reset 0 0 000000
Access R R R/W R/W R/W R/W R/W R/W
Port 4 pin register
Register symbol: P4IN
Address: x'36008088
Purpose: This register reads the value of the port 4 pins.
Bit No. 7 6 543210
Bit name - - P45I P44I P43I P42I P41I P40I
Reset 0 0 XXXXXX
Access RRRRRRRR