Panasonic MN101C77C, F77G user manual Interrupt Flag Setting

Chapter 15 A/D Converter

15-3-2 Setup Example

„A/D Converter Setup Example by Registers

A/D conversion is started by setting registers. The analog input pins are set to AN0, the converter clock is set to fs/4, and the sampling hold time is set to TAD x 6. Then, A/D conversion complete interrupt is generated.

An example setup procedure, with a description of each step is shown below.

Setup Procedure		Description
(1) Set the analog input pin.	(1) Set the analog input pin (set at the procedure
PAIMD(x'3F3C')	2) to the special function pin by the port A input
bp0 : PAIMD0 = 1	mode register (PAIMD). Also, set to no pull-up/
PAPLUD (x'3F4A')	pull-down resistance by the port A pull-up/pull-
bp0 : PAPLUD0 = 0	down resistance control register (PAPLUD),
PADIR (x'3F3A')	and to input mode by port A direction control
bp0 : PADIR0 = 0	register (PADIR).
(2) Select the analog input pin.	(2) Select the analog input pin from AN7-0 (PA7-
ANCTR1(x'3FB1')	0) by the ANCHS2-0 flag of the A/D converter
bp2-0 : ANCHS2-0 = 000	control register 1 (ANCTR1).
(3) Select the A/D converter clock.	(3) Select the A/D converter clock by the
ANCTR0 (x'3FB0')	ANCK1, ANCK0 flag of the A/D converter
bp5-4 : ANCK1-0 = 01	control register 0 (ANCTR0).
(4) Set the sample and hold time.	(4) Set the sample and hold time by the ANSH1,
ANCTR0 (x'3FB0')	ANSH0 flag of the A/D converter control
bp7-6 : ANSH1-0 = 01	register 0 (ANCTR0).
(5) Set the interrupt level.	(5) Set the interrupt level by the ADLV1-0 flag of
ADICR (x'3FFA')	the A/D conversion complete interrupt control
bp7-6 : ADLV1-0 = 00	register (ADICR). If any interrupt request flag
	is already set, clear them.
	[	Chapter 3. 3-1-4 Interrupt Flag Setting ]
(6) Enable the interrupt.	(6) Enable the interrupt by setting the ADIE flag
ADICR (x'3FFA')	the ADICR register to "1".
bp1 : ADIE = 1

XV - 12 Operation