HT47C20L View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT47C20L' PDF : 55 Pages View PDF
HT47C20L
Bit No.
0
1
2~3
4
5
6
7
Label
Function
OVB/OVA
In the RC type A/D converter mode, this bit is used to define the timer/event counter inter-
rupt which comes from timer A overflow or timer B overflow.
(0= timer A overflow; 1= timer B overflow)
In the timer/event counter mode, this bit is void.
ADC/TM
To define 16-bit timer/event counter or RC type A/D converter is enable.
(0= timer/event counter enable; 1= A/D converter is enable)
¾
Unused bits, read as ²0²
To define the A/D converter operating mode (M3, M2, M1, M0)
0000= IN0 external clock input mode
0001= RS0~CS0 oscillation (reference resistor and reference capacitor)
M0 0010= RT0~CS0 oscillation (resistor sensor and reference capacitor)
M1 0011= CRT0~CS0 oscillation (resistor sensor and reference capacitor)
M2 0100= RS0~CRT0 oscillation (reference resistor and sensor capacitor)
M3 0101= RS1~CS1 oscillation (reference resistor and reference capacitor)
0110= RT1~CS1 oscillation (resistor sensor and reference capacitor)
0111= IN1 external clock input mode
1XXX= Undefined mode
ADCR (25H) Register
S1
S y s te m C lo c k
S2
S y s te m C lo c k /4
S3
R T C O u tp u t
T im e r A
O V B /O V A = 0
TO N
T im e r B
O V B /O V A = 1
In te rru p t
R esetT O N
S 12
S4
S5
S6
IN 0
CS0
C R T0
S7
S8
RS0
R T0
S 13
S9
S 10
S 11
IN 1
CS1
RS1
R T1
TN 2 TN 1 TN 0 S1 S2 S3
0
0
0
1
0
0
0
0
1
0
1
0
0
1
0
0
0
1
O th e r
0
0
0
N o te : 0 = o ff, 1 = o n
M 3 M 2 M 1 M 0 S4 S5 S6
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
0
1
0
0
0
0
1
1
1
0
1
0
1
0
0
0
1
0
0
1
0
1
0
0
0
0
1
1
0
0
0
0
0
1
1
1
0
0
0
1
0
0
0
N o te : 0 = o ff, 1 = o n
RC Type A/D Converter
S7 S8
0
0
1
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
S 9 S 10 S 11 S 12 S 13
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
1
1
0
0
1
1
0
1
0
1
0
0
0
0
1
0
0
0
0
0
Rev. 2.30
19
December 2, 2005
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