NEC V850E/PH2, User Manual

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Chapter 14 A/D Converter
User’s Manual U16580EE3V1UD00
(2) A/D converter n mode register 1 (ADMn1)
The ADMn1 register is an 8-bit register that specifies the conversion operation time and trigger
mode.
This register can be read or written in 8-bit or 1-bit units.
Reset input sets this register to 00H.
Cautions: 1. Changing the setting of the EGAn1, EGAn0, and FRn3 to FRn0 bits is prohibited
while A/D conversion is enabled (ADCEn bit of the ADMn0 register = 1).
2. When data is written to the ADMn1 register during an A/D conversion operation,
the conversion operation is initialized and conversion is executed from the
beginning.
Figure 14-3: A/D Converter n Mode Register 1 (ADMn1) (1/2)
Remark: n = 0, 1
After reset: 00H R/W Address: ADM01 FFFFF201H,
ADM11 FFFFF241H
7 6 5 4 3 2 1 0
ADMn1 EGAn1 EGAn0 TRGn1 TRGn0 FRn3 FRn2 FRn1 FRn0
(n = 0, 1)
EGAn1 EGAn0 Valid Edge Specification of External Trigger Input (ADTRGn)
0 0 No edge detected (does not operate as external trigger)
0 1 Falling edge detected
1 0 Rising edge detected
1 1 Both edges, falling and rising edge detected
TRGn1 TRGn0 ADCn Trigger Mode Specification
0 0 A/D trigger mode
0 1 Timer trigger mode
1 0 External trigger mode
1 1 Setting prohibited