tmp89fm42a TOSHIBA Semiconductor CORPORATION, tmp89fm42a Datasheet - Page 329

• Manufacturer Part Number: tmp89fm42a
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

20.4
Register Setting
RA002
20.4
20.5
ADCDRL and ADCDRH are initialized to "0". If any of these modes is started during AD conversion, AD conversion
is suspended, and the AD converter stops (registers are likewise initialized). When restored from STOP/ IDLE0/
SLOW mode, AD conversion is not automatically restarted. Therefore, registers must be reconfigured as necessary.
nected and, therefore, there is no possibility of current flowing into the analog reference voltage.
If STOP/IDLE0/SLOW mode is started, registers ADCCR1<ADRS, AMD, AINEN>, ADCCR2<EOCF, ADBF>,
If STOP/IDLE0/SLOW mode is started during AD conversion, analog reference voltage is automatically discon-
SLOOP :
Starting STOP/IDLE0/SLOW Modes
1. Set the AD converter control register 1 (ADCCR1) as described below:
2. Set the AD converter control register 2 (ADCCR2) as described below:
3. After the above two steps are completed, set "1" on the AD conversion start (ADRS) of the AD converter
4. As AD conversion is finished, the AD conversion end flag (EOCF) of the AD converter control register 2
5. After the conversion result is read from the AD converted value register (ADCDRH), EOCF is cleared to
Register Setting
control register 1 (ADCCR1), and AD conversion starts immediately if single mode is selected.
(ADCCR2) is set to "1", the AD conversion result is stored in the AD converted value registers (ADCDRH
and ADCDRL), and the INTADC interrupt request is generated.
"0". EOCF will also be cleared to "0" if AD conversion is performed once again before reading the AD
converted value register (ADCDRH). In this case, the previous conversion result is retained until AD con-
version is finished.
Example: After selecting the conversion time 15.6 μs at 10 MHz and the analog input channel AIN3 pin, perform AD
・ From the AD input channel select (SAIN), select the channel in which AD conversion is to be performed.
・ Set the analog input control (AINEN) to "Analog input enable".
・ At AMD, specify the AD operating mode (single or repeat mode).
・ At the AD conversion time (ACK), specify the AD conversion time. For information on how to specify
the conversion time, refer to the AD converter control register 2 and Table 20-1.
: (Port setting)
LD
LD
SET
TEST
J
LD
conversion once. After checking EOCF, store the conversion result in the HL register. The operation mode is
single mode.
(ADCCR1), 0y00110011
(ADCCR2), 0y00000010
(ADCCR1). 7
(ADCCR2). 7
T, SLOOP
HL, (ADCDRL)
Page 310
;Before setting AD converter registers, make an appropriate port
;register setting.(For further details, refer to the section that describes
;I/O ports.)
;Select AIN3 and operation mode
;Select conversion time (156/fcgck)
;ADRS = 1 (AD conversion start)
;EOCF = 1 ?
;Read result data
TMP89FM42A