Panasonic MN101C77C - Manual (Page 487)

Operation
Chapter 15 A/D Converter
XV - 13
Setup Procedure Description
(7) Set the ANLADE flag of the A/D converter
control register 0 (ANCTR0) to "1" to send a
current to the ladder resistance for the A/D
conversion.
(8) Set the ANSTSEL flag of the A/D converter
control register 2 (ANCTR2) to "0", and select
"writing to the ANST flag of the A/D converter
control register 2 (ANCTR2)"as the A/D
converter activation factor.
(9) Set the ANST flag of the A/D converter control
register 2 (ANCTR2) to "1" to start the A/D
conversion.
(10) When the A/D conversion is finished, the A/D
conversion complete interrupt is generated
and the ANST flag of the A/D converter control
register 2 (ANCTR2) is cleared to "0". The
result of the conversion is stored to the A/D
converter buffer (ANBUF0, 1).
Note : The above (3) to (4) can be set at once.
(7) Set the A/D ladder resistance.
ANCTR0 (x'3FB0')
bp3 : ANLADE = 1
(8) Start the A/D conversion.
ANCTR2 (x'3FB2')
bp6 : ANSTSEL = 0
(9) Start the A/D conversion operation.
ANCTR2 (x'3FB2')
bp7 : ANST = 1
(10) Complete the A/D conversion.
ANBUF0 (x'3FB3')
ANBUF1 (x'3FB4')
Start the A/D conversion after the current flowing through the ladder resistors stabilizes. The
wait time should be decided by the caluculated times from the ladder resistance (max. 80
k
Ω
), and the external bypass capacitor connected between V REF + and V REF -.