C8051F2XX Datasheet, PDF (45/146 Pages) Silicon Laboratories – Mixed Signal 8 kB ISP Flash MCU Family

C8051F2xx
SFR Definition 6.4. ADC0H: ADC Data Word MSB (C8051F206)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0 SFR Address:
0xBF
Bits7–0:
ADC Data Word Bits
For ADLJST = 1: Upper 8-bits of the 12-bit ADC Data Word.
For ADLJST = 0: Bits7–4 are the sign extension of Bit3. Bits 3–0 are the upper 4-bits of the
12-bit ADC Data Word.
SFR Definition 6.5. ADC0L: ADC Data Word LSB (C8051F206)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0 SFR Address:
0xBE
Bits7–0:
ADC Data Word Bits
For ADLJST = 1: Bits7–4 are the lower 4-bits of the 12-bit ADC Data Word. Bits3–0 will
always read 0.
For ADLJST = 0: Bits7–0 are the lower 8-bits of the 12-bit ADC Data Word.
NOTE: Resulting 12-bit ADC Data Word appears in the ADC Data Word Registers as follows:
ADC0H[3:0]:ADC0L[7:0], if ADLJST = 0
(ADC0H[7:4] will be sign extension of ADC0H.3 if a differential reading, otherwise = 0000b)
ADC0H[7:0]:ADC0L[7:4], if ADLJST = 1
(ADC0L[3:0] = 0000b)
EXAMPLE: ADC Data Word Conversion Map, AIN0 Input in Single-Ended Mode
(AMX0CF=0x00, AMX0SL=0x00)
AIN0 – AGND (Volts)
REF x (4095/4096)
REF x ½
REF x (2047/4096)
0
ADC0H:ADC0L
(ADLJST = 0)
0x0FFF
0x0800
0x07FF
0x0000
ADC0H:ADC0L
(ADLJST = 1)
0xFFF0
0x8000
0x7FF0
0x0000
Rev. 1.6
45