PIC12F639 Microchip Technology, PIC12F639 Datasheet - Page 43

• Manufacturer Part Number: PIC12F639
• Description: (PIC12F635 / PIC12F636 / PIC12F639) 8/14-PIN FLASH-BASED / 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY
• Manufacturer: Microchip Technology

REGISTER 4-3:
REGISTER 4-4:
© 2005 Microchip Technology Inc.
bit 7-6:
bit 5-0:
bit 7-6:
bit 5-0:
PORTA – PORTA REGISTER (ADDRESS: 05h)
TRISA – PORTA TRI-STATE REGISTER (ADDRESS: 85h)
bit 7
Unimplemented: Read as ‘0’
RA<5:0>: PORTA I/O pins
1 = Port pin is > V
0 = Port pin is < V
Legend:
R = Readable bit
- n = Value at POR
bit 7
Unimplemented: Read as ‘0’
TRISA<5:0>: PORTA Tri-State Control bits
1 = PORTA pin configured as an input (tri-stated)
0 = PORTA pin configured as an output
Legend:
R = Readable bit
- n = Value at POR
Note 1: TRISA<3> always reads ‘1’.
U-0
U-0
—
—
2: TRISA<5:4> always reads ‘1’ in XT, HS and LP Oscillator modes.
U-0
U-0
—
—
IH
IL
TRISA5
R/W-x
PIC12F635/PIC16F636/639
RA5
R/W-1
Preliminary
W = Writable bit
‘1’ = Bit is set
W = Writable bit
‘1’ = Bit is set
(2)
TRISA4
R/W-x
RA4
R/W-1
(1,2)
(2)
TRISA3
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
RA3
R-x
R-1
(1)
TRISA2
R/W-1
R/W-x
RA2
x = Bit is unknown
x = Bit is unknown
TRISA1
R/W-1
R/W-0
RA1
DS41232B-page 41
TRISA0
R/W-0
R/W-1
RA0
bit 0
bit 0