NEC PD754244 Manuel D’Utilisation

User’s Manual  U10676EJ3V0UM

(1) An analog input voltage input to the PTH00 pin is A/D converted with 4-bit resolution.

PTH00 input voltage

Reference voltage (V

REF

) 

AV

REF

7.5/16 

⋅ AV

REF

V

SS

Conversion
start

Conversion
end

Comparison result

1

0

1

0

<Program example> The conversion result is stored in bit sequential buffer BSB0 (refer to 6.6 Bit Sequential

Buffer).

ADCONV: SET

MBE

SEL

MB15

MOV

HL, #0D3H

; H 

← higher 4 bits of PTH0, L ← bit 3 specification

MOV

XA, #0C0H

MOV

BSB0, A

; BSB0 

← 0

LOOP:

SET1

BSB0, @L

MOV

A, BSB0

MOV

PTHM, XA

; Comparison start

MOV

A, #04H

; 36-machine-cycle wait

WAIT:

INCS

A

BR

WAIT

MOV1

CY, @H+PTH0.0 ; Conversion result input

MOV1

BSB0, @L, CY

; Conversion result store

DECS

L

BR

LOOP

; Conversion end