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Rev. 5.00, 09/03, page 570 of 760
18.3 Register Descriptions
18.3.1 Port A Control Register (PACR)
Bit: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PA7
MD1
PA7
MD0
PA6
MD1
PA6
MD0
PA5
MD1
PA5
MD0
PA4
MD1
PA4
MD0
PA3
MD1
PA3
MD0
PA2
MD1
PA2
MD0
PA1
MD1
PA1
MD0
PA0
MD1
PA0
MD0
Initial value:0000000000000000
R/W: R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
The port A control register (PACR) is a 16-bit readable/writable register that selects the pin
functions. PACR is initialized to H'0000 by a power-on reset, but is not initialized by a manual
reset, in standby mode, or in sleep mode.
Bits 15 and 14—PA7 Mode 1 and 0 (PA7MD1, PA7MD0)
Bits 13 and 12—PA6 Mode 1 and 0 (PA6MD1, PA6MD0)
Bits 11 and 10—PA5 Mode 1 and 0 (PA5MD1, PA5MD0)
Bits 9 and 8—PA4 Mode 1 and 0 (PA4MD1, PA4MD0)
Bits 7 and 6—PA3 Mode 1 and 0 (PA3MD1, PA3MD0)
Bits 5 and 4—PA2 Mode 1 and 0 (PA2MD1, PA2MD0)
Bits 3 and 2—PA1 Mode 1 and 0 (PA1MD1, PA1MD0)
Bits 1 and 0—PA0 Mode 1 and 0 (PA0MD1, PA0MD0)
These bits select the pin functions and perform input pull-up MOS control.
Bit (2n + 1) Bit 2n
PAnMD1 PAnMD0 Pin Function
0 0 Other function (see table 18.1) (Initial value)
0 1 Port output
1 0 Port input (Pull-up MOS: on)
1 1 Port input (Pull-up MOS: off)
(n = 0 to 7)