41594B datasheet(145/372 Pages) MICROCHIP

145 / 372 page

 2011-2012 Microchip Technology Inc.

Preliminary

DS41594B-page 145

PIC12LF1840T48A

TABLE 18-1:

SRCLK FREQUENCY TABLE

SRCLK

Divider

FOSC = 32 MHz

FOSC = 20 MHz

FOSC = 16 MHz

FOSC = 4 MHz

FOSC = 1 MHz

111

512

62.5 kHz

39.0 kHz

31.3 kHz

7.81 kHz

1.95 kHz

110

256

125 kHz

78.1 kHz

62.5 kHz

15.6 kHz

3.90 kHz

101

128

250 kHz

156 kHz

125 kHz

31.25 kHz

7.81 kHz

100

500 kHz

313 kHz

250 kHz

62.5 kHz

15.6 kHz

011

1 MHz

625 kHz

500 kHz

125 kHz

31.3 kHz

010

2 MHz

1.25 MHz

1 MHz

250 kHz

62.5 kHz

001

4 MHz

2.5 MHz

2 MHz

500 kHz

125 kHz

000

8 MHz

5 MHz

4 MHz

1 MHz

250 kHz

SRCON0: SR LATCH CONTROL 0 REGISTER

R/W-0/0

R/S-0/0

SRLEN

SRCLK2

SRCLK1

SRCLK0

SRQEN

SRNQEN

SRPS

SRPR

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = Bit is unchanged

x = Bit is unknown

-n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set

‘0’ = Bit is cleared

S = Bit is set only

bit 7

SRLEN: SR Latch Enable bit

1 = SR Latch is enabled

0 = SR Latch is disabled

bit 6-4

SRCLK<2:0>: SR Latch Clock Divider bits

000 = Generates a 1 FOSC wide pulse every 4th FOSC cycle clock

001 = Generates a 1 FOSC wide pulse every 8th FOSC cycle clock

010 = Generates a 1 FOSC wide pulse every 16th FOSC cycle clock

011 = Generates a 1 FOSC wide pulse every 32nd FOSC cycle clock

100 = Generates a 1 FOSC wide pulse every 64th FOSC cycle clock

101 = Generates a 1 FOSC wide pulse every 128th FOSC cycle clock

110 = Generates a 1 FOSC wide pulse every 256th FOSC cycle clock

111 = Generates a 1 FOSC wide pulse every 512th FOSC cycle clock

bit 3

SRQEN: SR Latch Q Output Enable bit

If SRLEN = 1:

1 = Q is present on the SRQ pin

0 = External Q output is disabled

If SRLEN = 0:

SR Latch is disabled

bit 2

SRNQEN: SR Latch Q Output Enable bit

If SRLEN = 1:

1 =Q is present on the SRnQ pin

0 = External Q output is disabled

If SRLEN = 0:

SR Latch is disabled

bit 1

SRPS: Pulse Set Input of the SR Latch bit(1)

1 = Pulse set input for 1 Q-clock period

0 = No effect on set input.

bit 0

SRPR: Pulse Reset Input of the SR Latch bit(1)

1 = Pulse reset input for 1 Q-clock period

0 = No effect on Reset input.

Note 1:

Set only, always reads back ‘0’.

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