System information

Analog Input

VSBC-6 Reference Manual Reference – 43

ADC D

ATA

IGH

EGISTER

ADCHI (READ) 00E5h (or 01E5h via CMOS Setup)

D7 D6 D5 D4 D3 D2 D1 D0

D11 / 0 D11 / 0 D11 / 0 D11 / 0 D11 D10 D9 D8

The ADCHI register is a read register containing the upper 4 bits of data from the A/D

conversion results. It is used in conjunction with the ADCLO register to read the complete 12-bit

data word.

When reading data, it is normal convention to read the ADCLO register first, followed by the

ADCHI register.

Table 20: ADCHI Bit Assignments

Bit Mnemonic Description

D7-D4 D11 / 0

Sign Extension

— These four bits read as "0" in unipolar input mode

(BIP = 0), in bipolar input mode, D11 is duplicated (sign extended) into

these four bits.

D3-D0 ADCDATA A/D Input Data (Most Significant Nibble) — These bits contain data

bits D11 through D8 of the conversion results.