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IV ANALOG BLOCK: A/D CONVERTER
S1C33L03 FUNCTION PART EPSON B-IV-2-13
A-1
B-IV
A/D
ST1–ST0: Sampling-time setup (D[1:0]) / A/D sampling register (0x40245)
Sets the analog input sampling time.
Table 2.8 Sampling Time
ST1 ST0 Sampling Time
11 9-clock period
10 7-clock period
01 5-clock period
00 3-clock period
The A/D converter input clock is used for counting.
At initial reset, ST is set to "11" (9-clock period).
To maintain the conversion accuracy, use ST as set by default (9-clock period).
PAD2–PAD0:
A/D converter interrupt level (D[6:4]) / Serial I/F Ch.1, A/D interrupt priority register (0x4026A)
Sets the priority level of the A/D-converter interrupt in the range of 0 to 7.
At initial reset, PAD becomes indeterminate.
EADE:
A/D converter interrupt enable (D0) / Port input 4–7, clock timer, A/D interrupt enable register (0x40277)
Enables or disables an interrupt to the CPU generated by the A/D converter.
Write "1": Interrupt enabled
Write "0": Interrupt disabled
Read: Valid
EADE is an interrupt enable bit to control the A/D converter interrupt.
When EADE is set to "1", the A/D converter interrupt is enabled. When EADE is set to "0", the A/D-converter
interrupt is disabled.
At initial reset, EADE is set to "0" (interrupt disabled).
FADE:
A/D converter interrupt factor flag (D0) / Port input 4–7, clock timer, A/D interrupt factor flag register (0x40287)
Indicates the status of an A/D-converter interrupt factor generated.
When read
Read "1": Interrupt factor has occurred
Read "0": No interrupt factor has occurred
When written using the reset-only method (default)
Write "1": Interrupt factor flag is reset
Write "0": Invalid
When written using the read/write method
Write "1": Interrupt flag is set
Write "0": Interrupt flag is reset
FADE is the interrupt factor flag of the A/D converter. It is set to "1" upon completion of A/D conversion in one
channel (i.e., when the conversion results are written into the ADD register).
At this time, if the following conditions are met, an interrupt to the CPU is generated:
1. The corresponding interrupt enable register bit is set to "1".
2. No other interrupt request of a higher priority has been generated.
3. The IE bit of the PSR is set to "1" (interrupts enabled).
4. The value set in the corresponding interrupt priority register is higher than the interrupt level (IL) of the CPU.
When using the interrupt factor of the A/D converter to request IDMA, note that even when the above conditions
are met, no interrupt request to the CPU is generated for the interrupt factor that has occurred. If interrupts are
enabled at the setting of IDMA, an interrupt is generated under the above conditions after the data transfer by
IDMA is completed.