TMP86FS49AIUG datasheet(233/296 Pages) TOSHIBA

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Page 217

TMP86FS49AIUG

17.4 STOP/SLOW Modes during AD Conversion

When standby mode (STOP or SLOW mode) is entered forcibly during AD conversion, the AD convert operation

is suspended and the AD converter is initialized (ADCCR1 and ADCCR2 are initialized to initial value). Also, the

conversion result is indeterminate. (Conversion results up to the previous operation are cleared, so be sure to read

the conversion results before entering standby mode (STOP or SLOW mode).) When restored from standby mode

(STOP or SLOW mode), AD conversion is not automatically restarted, so it is necessary to restart AD conversion.

Note that since the analog reference voltage is automatically disconnected, there is no possibility of current flowing

into the analog reference voltage.

Example :After selecting the conversion time 19.5

µs at 16 MHz and the analog input channel AIN3 pin, perform AD con-

version once. After checking EOCF, read the converted value, store the lower 2 bits in address 0009EH nd store

the upper 8 bits in address 0009FH in RAM. The operation mode is software start mode.

: (port setting)

;Set port register approrriately before setting AD

converter registers.

(Refer to section I/O port in details)

(ADCCR1) , 00100011B

; Select AIN3

(ADCCR2) , 11011000B

;Select conversion time(312/fc) and operation

mode

SET

(ADCCR1) . 7

; ADRS = 1(AD conversion start)

SLOOP :

TEST

(ADCDR2) . 5

; EOCF= 1 ?

JRS

T, SLOOP

A , (ADCDR2)

; Read result data

(9EH) , A

A , (ADCDR1)

; Read result data

(9FH), A

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