UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 60

• 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

5.1
peripheral hardware, and a circuit that generates a clock (interval time generation clock) to be supplied to the
watchdog timer and 8-bit timer H1 (TMH1).
5.1.1
5.1.2
60
The clock generators include a circuit that generates a clock (system clock) to be supplied to the CPU and
The following three types of system clock oscillators are used.
The system clock source is selected by using the option byte. For details, refer to CHAPTER 13 OPTION BYTE.
When using the EXCLK pin as I/O port pins, refer to CHAPTER 4 PORT FUNCTIONS for details.
The following circuit is used as a clock oscillator for interval time generation.
High-speed internal oscillator
This circuit internally oscillates a clock of 8 MHz (TYP.). Its oscillation can be stopped by execution of the STOP
instruction.
If the High-speed internal oscillator is selected to supply the system clock, the EXCLK pin can be used as I/O
port pins.
External clock input circuit
This circuit supplies a clock from an external IC to the EXCLK pin. A clock of 1 MHz to 10 MHz can be supplied.
Internal clock supply can be stopped by execution of the STOP instruction.
Low-speed internal oscillator
This circuit oscillates a clock of 240 kHz (TYP.). Its oscillation can be stopped by using the low-speed internal
oscillation mode register (LSRCM) when it is specified by the option byte that its oscillation can be stopped by
software.
Functions of Clock Generators
System clock oscillators
Clock oscillator for interval time generation
CHAPTER 5 CLOCK GENERATORS
Preliminary User’s Manual U18681EJ1V0UD