SH7040 Datasheet, PDF (611/923 Pages) Renesas Technology Corp – Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

• Bit 5—A/D Start (ADST): Selects start/end of A/D conversion. A1 is maintained during A/D
conversion start. It is also possible to set a 1 by the A/D conversion trigger input pin
(ADTRG).
Bit 5:
ADST
0
1
Description
A/D conversion halted
(Initial value)
1. Single mode: Starts A/D conversion. Automatically clears to 0 when conversion of
the designated channel is complete
2. Scan mode: Starts A/D conversion. Continuous conversion until cleared to 0 by the
software
• Bit 4—Scan Mode (SCAN): Selects the A/D conversion mode from single mode and scan
mode. For operations during single/scan mode, see section 16.4, Operation. When switching
modes, proceed while ADST=0.
Bit 4:
SCAN
0
1
Description
Single mode
Scan mode
(Initial value)
• Bit 3—Clock Select (CKS): Sets the A/D conversion time. Proceed conversion time switch
while adst=0. Always set CKS=0 when operating frequency exceeds 20MHz.
Bit 3:
CKS
0
1
Description
Conversion time = 266 states (max)
Conversion time = 134 states (max)
(Initial value)
• Bit 2—Reserved bit: Bit 2 always reads 0. Furthermore, always write 0.
• Bits 1, 0—Channel select 1, 0 (CH1, CH0): Selects the analog input channel along with the
SCAN bit. Switch channels while ADST=0.
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