Users Manual & Installation Guide
PV- 1800:
Power supply module with GSM MODEM
Page 17 / 21
REG_ADCLO
(base+0Ah): ADC command, status, and result low byte (read/write)
Writing to this register starts a new A/D conversion. You should only do this
when the ADC is idle.
Command bits: 0000
dccc
d
: 0:single-ended, 1=differential
ccc
: Channel.
d c c c Conversion
0 0 0 0 AIN0 relative to AGND
0 0 0 1 AIN1 relative to AGND
0 0 1 0 AIN2 relative to AGND
0 0 1 1 AIN3 relative to AGND
0 1 0 0 AIN4 relative to AGND
0 1 0 1 AIN5 relative to AGND
0 1 1 0 AIN6 relative to AGND
0 1 1 1 AIN7 relative to AGND
1 0 0 0 Differential AIN0(+) - AIN1(-)
1 0 0 1 Differential AIN1(-) - AIN0(+)
1 0 1 0 Differential AIN2(+) - AIN3(-)
1 0 1 1 Differential AIN3(-) - AIN2(+)
1 1 0 0 Differential AIN4(+) - AIN5(-)
1 1 0 1 Differential AIN5(-) - AIN4(+)
1 1 1 0 Differential AIN6(+) - AIN7(-)
1 1 1 1 Differential AIN7(-) - AIN6(+)
Reading REG_ADCLO returns status and result bits.
Result bits:
rrrr
00
pb
p
: ADC present. If 1, the ADC is available. If 0, the ADC is not mounted, and
you should not write to REG_ADCLO.
b
: Busy. 0 = ADC idle. The previous result can be read, and a new conversion can
be started. 1 = conversion in progress. All result bits are invalid when
b
=1.
rrrr
: Four least-significant bits of the conversion result. Only valid when
b
=0.
REG_ADCHI
(base+0Bh): ADC result, high byte (read only)
Reading this register returns the eight most-significant bits of the conversion
result. Only valid when the ADC is idle.
