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SH7052 Datasheet(PDF) 611 Page - Renesas Technology Corp |
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SH7052 Datasheet(HTML) 611 Page - Renesas Technology Corp |
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611 / 919 page  585 16.4.4 External Triggering of A/D Converter A/D conversion can be externally triggered. To activate the A/D converter with an external trigger, first set the pin functions with the PFC (pin function controller) and input a high level to the ADTRG pin, then set the TRGE bit to 1 and clear the ADST bit to 0 in the A/D control register (ADCR), and set the EXTRG bit to 1 in the A/D trigger register (ADTRGR). When a low level is input to the ADTRG pin after these settings have been made, the A/D converter detects the low level and sets the ADST bit to 1. If a low level is being input to the ADTRG pin when A/D conversion ends, the ADST bit is set to 1 again, and A/D conversion is started. Figure 16.7 shows the timing for external trigger input. The ADST bit is set to 1 two states after the A/D converter samples the low level on the ADTRG pin. The timing from setting of the ADST bit until the start of A/D conversion is the same as when 1 is written into the ADST bit by software. ADTRG pin sampled ADTRG input ADST bit P φ ADST = 1 Figure 16.7 External Trigger Input Timing |
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