Section 13 A/D Converter (ADC)
Rev. 3.00 Sep. 27, 2007 Page 492 of 758
REJ09B0243-0300
13.4.5
A/D Converter Activation by MTU2
The A/D converter can be independently activated by an A/D conversion request from the interval
timer of the MTU2.
To activate the A/D converter by the MTU2, first set the TRGE bit in the A/D control/status
register (ADCSR) to 1, and then set the A/D trigger select register (ADTSR). After this register
setting has been made, the ADST bit in ADCR is automatically set to 1 when an A/D conversion
request from the interval timer of the MTU2 occurs. The timing from setting of the ADST bit until
the start of A/D conversion is the same as when 1 is written to the ADST bit by software.
13.4.6
External Trigger Input Timing
A/D conversion can be externally triggered. When the TRGE bit in the A/D control/status register
(ADCSR) is set to 1 while the TRGS3 to TRGS0 bits in the A/D trigger select register_0
(ADTSR_0) is set to external trigger input, external trigger input is enabled at the
ADTRG
pin. A
falling edge of the
ADTRG
pin sets the ADST bit to 1 in ADCR, starting A/D conversion. Other
operations, in both single and scan modes, are the same as when the ADST bit has been set to 1 by
software. Figure 13.3 shows the timing.
CK
ADTRG
External trigger
signal
ADST
A/D conversion
Figure 13.3 External Trigger Input Timing
Содержание SH7124 R5F7124
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