HT46R74D-1 Holtek Semiconductor, HT46R74D-1 Datasheet - Page 26

• Manufacturer Part Number: HT46R74D-1
• Description: Dual Slope A/D Type MCU
• Manufacturer: Holtek Semiconductor

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Note: 1: charge timer means the timer0 or timer 1 that select in the CHGTS registers.
Rev. 1.10
Bit No.
Bit No.
3~7
0~1
0
1
2
2
3
4
5
6
7
2: discharge timer means the timer0 or timer 1 that select in the DISTS registers.
3: timer auto start only set the TxS to 1, and auto stop only set the TxON to 0
4: auto set the discharge mode only set the ADDISCH1/0 to 1/0.
CHGCMP
AENDEN
ADISEN
ADCD0
ADCD1
ADCD2
CHGTS
ASTEN
DISTS
Label
Label
¾
¾
Defines the chopper clock. ADCCKEN should be enabled. The suggested clock value should
be around 10kHz.
The chopper clock definitions are:
0: clock= (f
1: clock= (f
2: clock= (f
3: clock= (f
4: clock= (f
5: clock= (f
6: clock= (f
7: clock= (f
Reserved
Unused bit, read as ²0²
Select the ADC CHARGE state timer
0: timer 0
1: timer1
Select the ADC discharge state timer
0: timer 0
1: timer 1
Select if the charge timer (note 1) will auto-start by the ADCMPO result or not. ASTEN should
be enabled.
0: immediately auto start timer counting (note 3) when charging begins
1: Wait for the ADCMPO rising edge to auto start timer counting (note 3) when charging be-
gins
Dual slope auto start enable. When this function is enabled, the charging timer (note 1) will
auto start (note 3) when the user sets ADDISCH to the charging mode. The start method is
determined by CHGCMP. 0: disable 1: enable this auto function
Dual slope auto discharge enable. When this function enable and ADDISCH is set to the
charging mode and the charging timer (note 1)) run overflow, the charging timer will auto stop
(note 3) and ADDISCH will be auto set to the discharging mode (note 4) and the discharging
timer (note 2) will auto start counting (note 3).
0: disable
1: enable this auto function
Dual slope Auto End Enable. When this function is enabled and ADDISCH is set to the dis-
charge mode and detects the ADCMPO falling edge, the discharging timer will auto stop
(note 2).
0: disable
1: enable this auto function
SYS
SYS
SYS
SYS
SYS
SYS
SYS
SYS
/32)/1
/32)/2
/32)/4
/32)/8
/32)/16
/32)/32
/32)/64
/32)/128
EADCR (1BH) Register
ADCD (1AH) Register
26
Function
Function
HT46R74D-1
January 11, 2007