UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 118

• Manufacturer Part Number: UPD78F9502MA-CAC-A
• Description: 8BIT MCU, 4K FLASH, 128B RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F9502MA-CAC-A

• Controller Family/series: UPD78F
• No. Of I/o's: 8
• Ram Memory Size: 128Byte
• Cpu Speed: 10MHz
• No. Of Timers: 2
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

10.1 Register for Confirming Reset Source
register (RESF) is used to store which source has generated the reset request.
118
Many internal reset generation sources exist in the
RESF can be read by an 8-bit memory manipulation instruction.
RESET input, reset signal generation 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 10-2.
Address: FF54H
Notes 3.
Symbol
RESF
Register
RESF
LVIM
LVIS
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
These values change as follows depending on the reset source.
7
0
0
1
0
1
After reset: 00H
Reset Source
Reset Source
WDTRF
LVIRF
Table 10-2. RESF Status When Reset Request Is Generated
Figure 10-5. 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)
Cleared (00H)
Cleared (0)
RESET Input
RESET Input
Preliminary User’s Manual U18681EJ1V0UD
CHAPTER 10 RESET FUNCTION
R
5
0
Internal reset request by low-voltage detector (LVI)
Internal reset request by watchdog timer (WDT)
Cleared (0)
Cleared (00H)
WDTRF
Cleared (0)
Reset by POC
Reset by POC
4
PD78F9500, 78F9501, 78F9502. The reset control flag
3
0
Set (1)
Held
Cleared (00H)
Set (1)
Held
Reset by WDT
Reset by WDT
2
0
Held
Set (1)
Held
Held
Set (1)
Reset by LVI
Reset by LVI
1
0
LVIRF
0