upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 740

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

19.2 Registers to Check Reset Source
(1)
Note: The value of this register is cleared to 00H when an external reset is executed via the RESET
Caution:
740
Symbol
RESF
R/W
The RESF register indicates from which source a reset signal has been generated.
This register is read-only, in 8-bit units.
RESET input/POC reset clears this register to 00H. The default value differs if reset is effected
from a source other than RESET.
Reset source flag register (RESF)
pin or when the Power on Clear occurred. When a reset is executed by the WDT2RES signal,
low-voltage detector (LVI), or clock monitor (CLM), the reset flag of the corresponding register
(WDT2RF bit, CLMRF bit, and LVIRF bit) is set to 1 (the other sources are held).
Only 0 can be written to each bit. If writing 0 and flag setting (occurrence of reset)
conflict, flag setting takes precedence.
WDT2RF
CLMRF
LVIRF
R
7
0
0
1
0
1
0
1
Figure 19-1: Reset Source Flag Register (RESF) Format
Internal reset request has not occurred, or RESF is cleared.
Internal reset request has occurred.
Internal reset request has not occurred, or RESF is cleared.
Internal reset request has occurred.
Internal reset request has not occurred, or RESF is cleared.
Internal reset request has occurred.
R
6
0
R
5
0
Chapter 19 RESET Function
WDT2RF
User’s Manual U16702EE3V2UD00
R/W
Generation of reset signal from WDT2
4
Generation of reset signal from CLM
Generation of reset signal from LVI
R
3
0
R
2
0
CLMRF LVIRF
R
1
R/W
0
FFFFF888H
Address
After reset
00H