upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 429

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

15.1 Register for Confirming Reset Source
store which source has generated the reset request.
Many internal reset generation sources exist in the
RESF can be read by an 8-bit memory manipulation instruction.
RESET input, reset by power-on-clear (POC) circuit, and reading RESF set RESF to 00H.
The status of RESF when a reset request is generated is shown in Table 15-3.
Address: FFACH
Symbol
RESF
Flag
WDTRF
LVIRF
Note The value after reset varies depending on the reset source.
Caution Do not read data by a 1-bit memory manipulation instruction.
WDTRF
LVIRF
7
0
0
1
0
1
After reset: 00H
Reset Source
Table 15-3. RESF Status When Reset Request Is Generated
Figure 15-5. 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.
6
0
Note
Cleared (0)
RESET Input
Preliminary User’s Manual U19014EJ1V0UD
CHAPTER 15 RESET FUNCTION
R
5
0
Internal reset request by low-voltage detector (LVI)
Internal reset request by watchdog timer (WDT)
µ
WDTRF
Cleared (0)
PD78F0730. The reset control flag register (RESF) is used to
Reset by POC
4
3
0
Set (1)
Held
Reset by WDT
2
0
Held
Set (1)
Reset by LVI
1
0
LVIRF
0
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