Analog Input "Bit Bang" Register - VersaLogic EBX-22 Reference Manual

IN
For more detailed information on the EBX-11 A/D converter, please refer to the
Semiconductor ADC78H90 Datasheet
A I "B
NALOG NPUT
A special register is available at 1D5h that enables the direct control ("bit banging") of the ADC.
To use this register, ADC field (bits D1-D0) of the MODCON register (1DFh) must be set to 0h
(see Table 44 for mode control settings).
ADCBB (Read/Write) 1D5h
D7
ADCIN Reserved
Bit Mnemonic
D7 ADCIN
D6-D3 –
D2 ADCCLK
D1 ADCOUT
D0 ADCCS0
EBX-22 Reference Manual
AX, DX ;16bit input reads current conversion data
;from SPIDATA1 into AH and from SPIDATA0 into
;AL
B " R
IT ANG EGISTER
D6 D5 D4
Reserved Reserved
Table 28: ADCBB Register Bit Assignments
Description
Analog Input – This bit is read only.
Reserved – These bits have no function.
Analog Clock – This bit is read/write.
Analog Output – This bit is read/write.
Analog Chip Select – This bit is read/write.
Interfaces and Connectors
D3 D2 D1
Reserved ADCCLK ADCOUT
National
D0
ADCCS0
55