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TMP88CS38 Datasheet(PDF) 124 Page - Toshiba Semiconductor |
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TMP88CS38 Datasheet(HTML) 124 Page - Toshiba Semiconductor |
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124 / 226 page  TMP88CS38/CM38A/CP38A 2007-09-12 88CS38-124 2.11.5 AD Converter Operation Modes When the MCU places in the STOP mode during the AD conversion, the conversion is stopped and the ADCDR2 content becomes indefinite. After returning from the STOP mode, the EOCF and INTADC does not occur. Therefore, the AD conversion must be restarted after returning from the STOP mode. Figure 2.11.4 AD Conversion Timing chart (1) AD conversion in STOP mode When the AD converter stop mode is specified during AD conversion, the AD conversion is stopped immediately. The AD conversion is not implemented, so the undefined value is not written to the AD conversion result register. The AD conversion start commands which occur is the AD converter stop mode are ignored. This mode is automatically selected by reset. This mode is used to change the AD converter operation mode. (2) Single mode When the AMD (Bit6, 5 to in ADCCRA) set to “01”, the AD conversion signal mode This mode does AD conversion of single channel, and conversion result is stored in ADCDR1. The EOCF (Bit5 in ADCDR2) is set to “1” at end of one conversion, and an intcrrupt request signal occurs. The EOCF is cleared to “0” by reading the AD conversion registers. But when the AD conversion is restarted before the ADCDR is read, the EOCF is cleared to “0” and the last AD conversion result is maintained till next conversion end. Do not set ADRS (Bit7 in ADCCRA) during AD conversion. Again set it after confirming with EOCF (Bit5 in ADCDR2) that the conversion is completed or after generating an interrupt signal (INTADC) (by the interrupt processing routine or the like). Figure 2.11.5 Single Mode Read Start Read Start Start Invalid Result Result Invalid Invalid ADS ADCDR2 EOCF Processing Invalid AD conversion result ADS ADCDR2 EOCF Conversion time (Reference to ADCCRB register) ADBF Start Read |
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