Information

PIC18F2XK20/4XK20
DS41303G-page 138  2010 Microchip Technology Inc.
10.8 Port Slew Rate Control
The output slew rate of each port is programmable to
select either the standard transition rate or a reduced
transition rate of 0.1 times the standard to minimize
EMI. The reduced transition time is the default slew
rate for all ports.
REGISTER 10-4: SLRCON: SLEW RATE CONTROL REGISTER
U-0 U-0 U-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
— — —SLRE
(1)
SLRD
(1)
SLRC SLRB SLRA
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7-5 Unimplemented: Read as ‘0’
bit 4 SLRE: PORTE Slew Rate Control bit
(1)
1 = All outputs on PORTE slew at a limited rate
0 = All outputs on PORTE slew at the standard rate
bit 3 SLRD: PORTD Slew Rate Control bit
(1)
1 = All outputs on PORTD slew at a limited rate
0 = All outputs on PORTD slew at the standard rate
bit 2 SLRC: PORTC Slew Rate Control bit
1 = All outputs on PORTC slew at a limited rate
0 = All outputs on PORTC slew at the standard rate
bit 1 SLRB: PORTB Slew Rate Control bit
1 = All outputs on PORTB slew at a limited rate
0 = All outputs on PORTB slew at the standard rate
bit 0 SLRA: PORTA Slew Rate Control bit
1 = All outputs on PORTA slew at a limited rate
(2)
0 = All outputs on PORTA slew at the standard rate
Note 1: These bits are not implemented on PIC18F2XK20 devices.
2: The slew rate of RA6 defaults to standard rate when the pin is used as CLKOUT.