UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 262
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
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Part Number:
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17.1 Functions of Option Byte
when starting after a reset, the option byte is automatically referenced, and settings for the specified functions are
performed. When using the product, be sure to set the following functions by using the option byte.
262
07FFH/0FFFH
The address 0080H of the flash memory of the 78K0S/KA1+ is an option byte area. When power is supplied or
(1) Selection of system clock source
(2) Low-speed internal oscillation clock oscillation
(3) Control of RESET pin
(4) Oscillation stabilization time on power application or after reset release
0080H
0000H
• High-speed internal oscillation clock
• Crystal/ceramic oscillation clock
• External clock input
• Cannot be stopped.
• Can be stopped by software.
• Used as RESET pin
• RESET pin is used as an input port pin (P34) (refer to 17.3 Caution When the RESET Pin Is Used as an
• 2
• 2
• 2
• 2
Input-Only Port Pin (P34)).
10
12
15
17
/f
/f
/f
/f
X
X
X
X
2048/4096
Flash memory
×
8 bits)
Figure 17-1. Positioning of Option Byte
CHAPTER 17 OPTION BYTE
User’s Manual U16898EJ5V0UD
Option byte
1
OSTS1
DEF
OSTS0
DEF
1
RMCE
OSCSEL1
OSCSEL0 LIOCP
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