MB95710M Series
MB95770M Series
Document Number: 002-09307 Rev. *D
Page 75 of 172
• Block diagram of PA0/COM0, PA1/COM1, PA2/COM2, PA3/COM3, PA4/COM4, PA5/COM5, PA6/COM6 and
PA7/COM7
18.8.3 Port A registers
• Port A register functions
• Correspondence between registers and pins for port A
Register
abbreviation
Data
Read
Read by read-modify-write
(RMW) instruction
Write
PDRA
0
Pin state is “L” level.
PDRA value is “0”.
As output port, outputs “L” level.
1
Pin state is “H” level.
PDRA value is “1”.
As output port, outputs “H” level.
DDRA
0
Port input enabled
1
Port output enabled
Correspondence between related register bits and pins
Pin name
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
PDRA
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
DDRA
PDRA
Pin
PDRA read
PDRA write
Executing bit manipulation instruction
DDRA read
DDRA write
DDRA
0
1
Stop mode, watch mode (SPL = 1)
LCD output
Inter
nal b
u
s
LCD output enable