UPD17073 NEC, UPD17073 Datasheet - Page 110

• Manufacturer Part Number: UPD17073
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
• Manufacturer: NEC

110
(2) Flowchart of binary search
(A/D converter reference
voltage setting register)
= #1000B
Detect content of A/D
converter reference voltage
setting register
Reset ADCRFSEL3 flag
Reset ADCRFSEL2 flag
Reset ADCRFSEL1 flag
Reset ADCRFSEL0 flag
Set ADCRFSEL2 flag
Set ADCRFSEL1 flag
Set ADCRFSEL0 flag
ADCCMP = 1?
ADCCMP = 1?
ADCCMP = 1?
ADCCMP = 1?
Initial setting
START
END
N
N
N
N
Y
Y
Y
Y
: Select pin to be used.
: Set reference voltage to 1/2V
: Detect reference voltage and,
: if "0", subtract 1/2V
: add both "0" and "1" to 1/4V
: Detect reference voltage and,
: if "0", subtract 1/4V
: add both "0" and "1" to 1/8V
: Detect reference voltage and,
: if "0", subtract 1/8V
: add both "0" and "1" to 1/16V
: Detect reference voltage and,
: if "0", subtract 1/16V
DD
DD
DD
DD
and,
and,
and,
and,
DD
DD
DD
DD
and set reference voltage.
and set reference voltage.
and set reference voltage.
PD17072,17073