Holtek HT66F002, Manual

Page: 100 / 144

Rev. 1.71 100 April 11, 2017 Rev. 1.71 101 April 11, 2017
HT66F002/HT66F0025/HT66F003/HT66F004
Cost-Effective A/D Flash MCU with EEPROM
HT66F002/HT66F0025/HT66F003/HT66F004
Cost-Effective A/D Flash MCU with EEPROM
• SADC0 Register – HT66F004
Bit 7 6 5 4 3 2 1 0
Name START ADBZ ENADC ADRFS — SACS2 SACS1 SACS0
R/W R/W R R/W R/W — R/W R/W R/W
POR 0 0 0 0 — 0 0 0
Bit 7
START
: Start the A/D conversion
0→ 1 →0: Start A/D conversion
0→1: Reset the A/D converter and set ADBZ to 0
1 →0: Start A/D conversion and set ADBZ to 1
Bit 6 ADBZ : ADC busy flag
0: A/D conversion ended or no conversion
1: A/D is busy
Bit 5 ENADC : ADC enable/disable control register
0: ADC disable
1: ADC enable
Bit 4
ADRFS
: A/D output data format selection bit
0: ADC output data format → SADOH=D[11:4]; SADOL=D[3:0]
1: ADC output data format → SADOH=D[11:8]; SADOL=D[7:0]
Bit 3~2 Unimplemented, read as “0”
Bit 1~0 SACS2~SACS0 : ADC input channels selection
000: ADC input channel comes from AN0
001: ADC input channel comes from AN1
010: ADC input channel comes from AN2
011: ADC input channel comes from AN3
100: ADC input channel comes from AN4
101: ADC input channel comes from AN5
110: ADC input channel comes from AN6
111: ADC input channel comes from AN7
• SADC1 Register
Bit 7 6 5 4 3 2 1 0
Name SAINS2 SAINS1 SAINS0 — — SACKS2 SACKS1 SACKS0
R/W R/W R/W R/W — — R/W R/W R/W
POR 0 0 0 — — 0 0 0
Bit 7~5
SAINS2~SAINS0
: Internal ADC input channel selection bit
000: ADC input only comes from external pin
001: ADC input also comes from AV
DD
010: ADC input also comes from AV
DD
/2
011: ADC input also comes from AV
DD
/4
101: ADC input also comes from V
R
110: ADC input also comes from V
R
/2
111: ADC input also comes from V
R
/4
Other Values: same as 000
Note: V
R
is OPA output voltage. V
R
can be one of V
REF
/V
REF
× 2/V
REF
× 3/V
REF
× 4/V
BG
× 2/ V
BG
×3/
V
BG
× 4.
Bit 4~3 Unimplemented, read as "0"
Bit 2~0 SACKS2~SACKS0 : ADC clock rate selection bit
000: SACLK=f
SYS
001: SACLK=f
SYS
/2
010: SACLK=f
SYS
/4
011: SACLK=f
SYS
/8
100: SACLK=f
SYS
/16
101: SACLK=f
SYS
/32
110: SACLK=f
SYS
/64
111: SACLK=f
SYS
/128