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CHAPTER 12 A/D CONVERTER
Preliminary User’s Manual U14581EJ3V0UM00
12.6 Cautions on Emulation
(1) D/A converter mode register (DAM1)
To perform debugging with an in-circuit emulator (IE-78K0-NS), the D/A converter mode register (DAM1) must
be set. DAM1 is a register used to set a probe board (IE-780852-NS-EM4).
DAM1 is used when the power-fail detection function is used. Unless DAM1 is set, the power-fail detection function
cannot be used. DAM1 is a write-only register.
Because the IE-780852-NS-EM4 uses an external analog comparator and a D/A converter to implement part of
the power-fail detection function, the reference voltage must be controlled. Therefore, set bit 0 (DACE) of DAM1
to 1 when using the power-fail detection function.
Figure 12-13. D/A Converter Mode Register (DAM1) Format
Address: FF89H After Reset: 00H W
Symbol
7
6
5
4
3
2
1
0
DAM1
0
0
0
0
0
0
0
DACE
DACE
Reference Voltage Control
0
Disabled
1
Enabled (when power-fail detection function is used)
Cautions 1. DAM1 is a special register that must be set when debugging is performed with an in-
circuit emulator. Even if this register is used, the operation of the
µ
PD780852 Subseries
is not affected. However, delete the instruction that manipulates this register from the
program at the final stage of debugging.
2. Bits 7 to 1 must be set to 0.
(2) A/D converter of IE-780852-NS-EM4
The A/D converter of the IE-780852-NS-EM4 may not satisfy the rating of the first A/D conversion value right after
A/D conversion has been started.
The above applies only to the IE-780852-NS-EM4 and does not affect the operation of the
µ
PD780852 Subseries.
Содержание mPD780852 Series
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