UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 262

• 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

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