UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 78

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

(2) Crystal/ceramic oscillator
78
Remark PCC:
(a) The internal reset signal is generated by the power-on-clear function on power application, the option byte is
(b) The option byte is referenced and the system clock is selected. Then the high-speed internal oscillation
If crystal/ceramic oscillation is selected by the option byte, a clock frequency of 2 to 10 MHz can be selected and
the accuracy of processing is improved because the frequency deviation is small, as compared with high-speed
internal oscillation (8 MHz (TYP.)).
Figures 5-10 and 5-11 show the timing chart and status transition diagram of default start by the crystal/ceramic
oscillator.
referenced after reset, and the system clock is selected.
clock operates as the system clock.
PPCC: Preprocessor clock control register
Figure 5-9. Status Transition of Default Start by High-Speed internal oscillation
Processor clock control register
Interrupt
HALT
CHAPTER 5 CLOCK GENERATORS
instruction
High-speed internal
Clock division ratio
oscillator selected
HALT
power-on-clear
variable during
CPU operation
by option byte
User’s Manual U16898EJ5V0UD
Reset by
application
Power
instruction
V
Start with PCC = 02H,
PPCC = 02H
STOP
DD
> 2.1 V (TYP.)
STOP
Interrupt
Reset signal