UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 533

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

(when X1 oscillation is selected)
(when X1 oscillation is selected)
Note Set P130 to high-level output by software.
Remark When reset is effected, P130 outputs a low level. If P130 is set to output a high level before reset is
Note Set P130 to high-level output by software.
Caution A watchdog timer internal reset resets the watchdog timer.
Remark When reset is effected, P130 outputs a low level. If P130 is set to output a high level before reset is
High-speed system clock
High-speed system clock
Internal reset signal
Internal reset signal
Internal high-speed
Internal high-speed
Watchdog timer
oscillation clock
oscillation clock
effected, the output signal of P130 can be dummy-output as the CPU reset signal.
effected, the output signal of P130 can be dummy-output as the CPU reset signal.
(except P130)
(except P130)
CPU clock
CPU clock
overflow
Port pin
Port pin
RESET
Port pin
Port pin
(P130)
(P130)
Figure 22-3. Timing of Reset Due to Watchdog Timer Overflow
Normal operation
Normal operation
Figure 22-2. Timing of Reset by RESET Input
CHAPTER 22 RESET FUNCTION
User’s Manual U17260EJ6V0UD
Delay
(oscillation stop)
(oscillation stop)
Reset period
Reset period
(5 s (TYP.))
µ
Delay
accuracy stabilization
accuracy stabilization
Wait for oscillation
Wait for oscillation
(86 to 361 s)
(86 to 361 s)
(11 to 45 s) µ
(11 to 45 s) µ
processing
processing
Reset
Reset
µ
µ
Hi-Z
Hi-Z
Starting X1 oscillation is specified by software.
Starting X1 oscillation is specified by software.
Normal operation
(internal high-speed oscillation clock)
Normal operation
(internal high-speed oscillation clock)
Note
Note
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