UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 80
UPD78F9222MC(T)-5A4-A
Manufacturer Part Number
UPD78F9222MC(T)-5A4-A
Description
8BIT MCU, 4K FLASH, 256B RAM, 78F9222
Manufacturer
NEC
Datasheet
1.UPD78F9222MCT-5A4-A.pdf
(414 pages)
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
Available stocks
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Part Number:
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Manufacturer:
NEC
Quantity:
1 000
Company:
Part Number:
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Quantity:
20 000
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(3) External clock input circuit
80
Remark PCC:
• High-speed operation
• Improvement of expandability
If external clock input is selected by the option byte, the following is possible.
Figures 5-12 and 5-13 show the timing chart and status transition diagram of default start by external clock input.
The accuracy of processing is improved as compared with high-speed internal oscillation (8 MHz (TYP.))
because an oscillation frequency of 2 to 10 MHz can be selected and an external clock with a small frequency
deviation can be supplied.
If the external clock input circuit is selected as the oscillator, the X2 pin can be used as an I/O port pin. For
details, refer to CHAPTER 4 PORT FUNCTIONS.
PPCC: Preprocessor clock control register
Figure 5-11. Status Transition of Default Start by Crystal/Ceramic Oscillation
Processor clock control register
Interrupt
HALT
CHAPTER 5 CLOCK GENERATORS
oscillation stabilization
oscillation selected
Clock division ratio
instruction
Crystal/ceramic
power-on-clear
variable during
CPU operation
HALT
Wait for clock
by option byte
User’s Manual U16898EJ5V0UD
Reset by
application
Power
V
Start with PCC = 02H,
PPCC = 02H
instruction
DD
STOP
> 2.1 V (TYP.)
STOP
Interrupt
Reset signal
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