UPD78F0138 NEC, UPD78F0138 Datasheet - Page 409

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

22.2 Configuration of Power-on-Clear Circuit
22.3 Operation of Power-on-Clear Circuit
V
POC detection voltage
POC
Supply voltage (V
Internal reset signal
The block diagram of the power-on-clear circuit is shown in Figure 22-1.
In the power-on-clear circuit, the supply voltage (V
, an internal reset signal is generated.
Mask option
(V
Figure 22-2. Timing of Internal Reset Signal Generation in Power-on-Clear Circuit
2.7 V
POC
DD
)
)
V
DD
Figure 22-1. Block Diagram of Power-on-Clear Circuit
CHAPTER 22 POWER-ON-CLEAR CIRCUIT
voltage source
V
Detection
DD
(V
POC
User’s Manual U16228EJ2V0UD
)
DD
) and detection voltage (V
+
POC
) are compared, and when V
Internal reset signal
Time
DD
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