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Chapter 22
(4)
Caution
718
PEMU1 - Peripheral emulation register 1
When an in-circuit emulator is used, the operation of the RAM retention flag
(RAMF bit: bit 0 of RAMS register) can be pseudo-controlled and emulated by
manipulating this register on the debugger.
This register can be read or written in 8-bit or 1-bit units.
This register is valid only in the emulation mode. It is invalid in the normal
mode.
After reset: 00H
R/W
7
6
PEMU1
0
0
EVARAMIN
Pseudo specification of RAM retention voltage detection signal
0
Do not detect voltage lower than RAM retention voltage.
1
Detect voltage lower than RAM retention voltage (set RAMF flag).
This bit is not automatically cleared.
[Usage]
When an in-circuit emulator is used, pseudo emulation of RAMF is realized
by rewriting this register on the debugger.
<1>
CPU break (CPU operation stops.)
<2>
Set the EVARAMIN bit to 1 by using a register write command.
By setting the EVARAMIN bit to 1, the RAMF bit is set to 1 on hardware (the
internal RAM data is invalid).
<3>
Clear the EVARAMIN bit to 0 by using a register write command again.
Unless this operation is performed (clearing the EVARAMIN bit to 0), the
RAMF bit cannot be cleared to 0 by a CPU operation instruction.
<4>
Run the CPU and resume emulation.
User's Manual U18743EE1V2UM00
Address: FFFFF9FEH
5
4
3
0
0
0
Low-Voltage Detector
2
1
0
EVARAMIN
0
0
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