upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 208

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

15.1 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.
208
03FFH/
07FFH/
0FFFH
0080H
0000H
The address 0080H of the flash memory of the 78K0S/KY1+ 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
• 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).
• 2
• 2
• 2
• 2
10
12
15
17
/f
/f
/f
/f
X
X
X
X
(1024/2048/4096
Flash memory
×
8 bits)
Figure 15-1. Positioning of Option Byte
CHAPTER 15 OPTION BYTE
User’s Manual U16994EJ3V0UD
Option byte
1
OSTS1
DEF
OSTS0
DEF
1
RMCE
OSCSEL1
OSCSEL0 LIOSP