r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 69

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
5.7
Figure 5.8
5.8
The cold start-up/warm start-up determination function uses the CWR bit in the RSTFR register to determine cold
start-up (reset process) at power-on and warm start-up (reset process) when a reset occurred during operation.
The CWR bit is set to 0 (cold start-up) at power-on and also set to 0 at a voltage monitor 0 reset. If 1 is written to
the CWR bit by a program, it is set to 1. This bit remains unchanged at a hardware reset, software reset, or
watchdog timer reset.
The cold start-up/warm start-up determination function uses voltage monitor 0 reset.
Figure 5.8 shows an Operating Example of Cold Start-Up/Warm Start-Up Function
The RSTFR register can be used to detect whether a hardware reset, software reset, or watchdog timer reset has
occurred.
If a hardware reset occurs, the HWR bit is set to 1 (detected). If a software reset occurs, the SWR bit is set to 1
(detected). If a watchdog timer reset occurs, the WDR bit is set to 1 (detected).
Cold Start-Up/Warm Start-Up Determination Function
Reset Source Determination Function
Operating Example of Cold Start-Up/Warm Start-Up Function
CWR bit in RSTFR register
Voltage monitor 0 reset
VCC
Vdet0
0V
5V
Set to 1 by
a program.
Set to 1 by
a program.
Page 37 of 740
5. Resets