upd78f0124m6gba1-8et Renesas Electronics Corporation., upd78f0124m6gba1-8et Datasheet - Page 366
upd78f0124m6gba1-8et
Manufacturer Part Number
upd78f0124m6gba1-8et
Description
8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0124M6GBA1-8ET.pdf
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19.1 Register for Confirming Reset Source
store which source has generated the reset request.
366
Many internal reset generation sources exist in the 78K0/KD1. The reset control flag register (RESF) is used to
RESF can be read by an 8-bit memory manipulation instruction.
RESET input, reset input by power-on-clear (POC) circuit, and reading RESF clear RESF to 00H.
The status of RESF when a reset request is generated is shown in Table 19-2.
Address: FFACH
Flag
WDTRF
CLMRF
LVIRF
Symbol
RESF
Note The value after reset varies depending on the reset source.
Caution Do not read data by a 1-bit memory manipulation instruction.
Reset Source
WDTRF
CLMRF
LVIRF
7
0
0
1
0
1
0
1
After reset: 00H
Table 19-2. RESF Status When Reset Request Is Generated
Figure 19-5. Format of Reset Control Flag Register (RESF)
Internal reset request is not generated, or RESF is cleared.
Internal reset request is generated.
Internal reset request is not generated, or RESF is cleared.
Internal reset request is generated.
Internal reset request is not generated, or RESF is cleared.
Internal reset request is generated.
Cleared (0)
RESET input
6
0
Note
CHAPTER 19 RESET FUNCTION
R
User’s Manual U16315EJ3V1UD
5
0
Cleared (0)
Reset by POC
Internal reset request by low-voltage detector (LVI)
Internal reset request by watchdog timer (WDT)
Internal reset request by clock monitor (CLM)
WDTRF
4
Set (1)
Held
Held
Reset by WDT
3
0
Held
Set (1)
Held
Reset by CLM
2
0
CLMRF
1
Held
Held
Set (1)
Reset by LVI
LVIRF
0
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