Filter
Top Products
I/O Ports
15-27
Port 4 dedicated output control register
Register symbol: P4SS
Address: x'36008048
Purpose: Along with P4MD, this register selects the content output on the port 4 pins.
Bit No. 7 6 543210
Bit name - - P45S P44S P43S - - -
Reset 0 0 000000
Access R R R/W R/W R/W R R R
P45M; P45S 00: Serial 1 data input/output (SBO1)
* The input/output setting is made through the serial interface 1 settings.
01: DRAM write signal output [for 2CAS] (DWE)
1x: General-purpose input/output port (P45)
P44M; P44S 00: Serial 1 data input (SBI1)
01: DRAM CAS signal 1 output [for 2CAS] (DCAS1)
1x: General-purpose input/output port (P44)
P43M; P43S 00: Serial 1 transfer clock input/output (SBT1)
* The input/output setting is made through the serial interface 1 settings.
01: DRAM CAS signal 0 output [for 2CAS] (DCAS0)
1x: General-purpose input/output port (P43)
P42M 0: Serial 0 data input/output (SBO0)
* The input/output setting is made through the serial interface 0 settings.
1: General-purpose input/output port (P42)
P41M 0: Serial 0 data input (SBI0)
1: General-purpose input/output port (P41)
P40M 0: Serial 1 transfer clock input/output (SBT0)
* The input/output setting is made through the serial interface 0 settings.
1: General-purpose input/output port (P40)
Note: If DWE, DCAS1, and DCAS0 are selected in the P4MD and P4SS registers, each of these control signals is
output, regardless of the value of P4DIR. The input/output settings for this general-purpose port are made
through the P4DIR register.