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I/O Ports
15-51
Port 9 output mode register
Register symbol: P9MD
Address: x'36008031
Purpose: This register selects the content output on the port 9 pins.
Bit No. 76543210
Bit name P97M P96M P95M P94M P93M P92M P91M P90M
Reset 01100000
Access R/W R/W R/W R/W R/W R/W R/W R/W
P97M 0: System clock output (SYSCLK)
1: General-purpose output port (P97)
P96M 0: Bus authority request signal (BR)
1: General-purpose input/output port (P96)
P95M 0: Data acknowledge signal input (DK)
1: General-purpose input/output port (P95)
P94M 0: Memory write signal output (WE1)
1: General-purpose output port (P94)
P93M 0: Memory write signal output (WE0)
1: General-purpose output port (P93)
P92M 0: Memory read signal output (RE)
1: General-purpose output port (P92)
P91M 1: General-purpose input/output port (P91)
P90M 1: General-purpose input/output port (P90)
Note: If BR and DK are selected in the P9MD register, these respective control signals are input regardless of the
value of P9DIR.
The input/output settings for this general-purpose port is made through the P9DIR register.