upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 784

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

(4)
Caution:
784
PEMU1
Symbol
R/W
Peripheral emulation register 1 (PEMU1)
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 is valid only in the emulation mode. It is invalid in the normal mode.
[Usage]
When an in-circuit emulator is used, pseudo emulation of RAMF is realized by rewriting this regis-
ter on the debugger.
<1>
<2>
<3>
<4>
EVARAMIN
This bit is not automatically cleared.
CPU break (CPU operation stops.)
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).
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.
Run the CPU and resume emulation.
R
7
0
0
1
R
Figure 24-5: Peripheral Emulation Register 1 (PEMU1)
6
0
Do not detect voltage lower than RAM retention voltage.
Detect voltage lower than RAM retention voltage (set RAMF flag).
R
5
0
Pseudo specification of RAM retention voltage detection signal
Chapter 24 Low-Voltage Detector
User’s Manual U16702EE3V2UD00
R
4
0
R
3
0
EVARAMIN
R/W
2
R
1
0
R
0
0
FFFFF9FEH
Address
After reset
00H