Datasheet

 1996 Microchip Technology Inc. Preliminary DS40122B-page 53
PIC14000
FIGURE 7-16: MISC REGISTER
9Eh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
MISC SMHOG SPGNDB SPGNDA I
2
CSEL SMBUS INCLKEN OSC2 OSC1
Read/Write R/W R/W R/W R/W R/W
R/W R/W R
POR value 00h 00000
0 0X
Bit Name Function
B7 SMHOG
SMHOG enable
1 = Stretch I
2
C CLK signal (hold low) when receive data buffer is full (refer to
Section 7.5.4). For pausing I
2
C transfers while preventing interruptions of A/D
conversions.
0 = Disable I
2
C CLK stretch.
B6 SPGNDB
Serial Port Ground Select
1 = PORTD<1:0> ground reference is the RD5/AN5 pin.
0 = PORTD<1:0> ground reference is V
SS.
B5 SPGNDA
Serial Port Ground Select
1 = PORTC<7:6> ground reference is the RA1/AN1 pin.
0 = PORTC<7:6> ground reference is V
SS.
B4 I
2
CSEL
I
2
C Port select Bit.
1 = PORTD<1:0> are used as the I
2
C clock and data lines.
0 = PORTC<7:6> are used as the I
2
C clock and data lines.
B3 SMBus
SMBus-Compatibility Select
1 = SMBus compatibility mode is enabled. PORTC<7:6> and PORTD<1:0> have
SMBus-compatible input thresholds.
0 = SMBus-compatibility is disabled. PORTC<7:6> and PORTD<1:0> have Schmitt Trig-
ger input thresholds.
B2 INCLKEN
Oscillator Output Select (available in IN mode only).
1 = Output IN oscillator signal divided by four on OSC2 pin.
0 = Disconnect IN oscillator signal from OSC2 pin.
B1 OSC2
OSC2 output port bit (available in IN mode only).
Writes to this location affect the OSC2 pin in IN mode. Reads return the value of the
output latch.
B0 OSC1
OSC1 input port bit (available in IN mode only).
Reads from this location return the status of the OSC1 pin in IN mode. Writes have no
effect.