Datasheet

CHAPTER 15 OPTION BYTE
User’s Manual U18172EJ3V0UD
219
15.1.2 μ PD78F950x
(1) Selection of system clock source
• High-speed internal oscillation clock
• External clock input
(2) Low-speed internal oscillation clock oscillation
• Cannot be stopped.
• Can be stopped by software.
(3) Control of RESET pin
• Used as RESET pin
• RESET pin is used as an input-only port pin (P34) (see 15.3 Caution When the RESET Pin Is Used as
an Input-Only Port Pin (P34)).
• The on-chip pull-up resistor on RESET pin is selected, or RESET pin is set open.
(4) Oscillation stabilization time on power application or after reset release
• 2
10
/fX
• 2
12
/fX
• 2
15
/fX
• 2
17
/fX
Figure 15-2. Positioning of Option Byte (
μ PD78F950x)
Option byte
OSCSEL1 RMCE11
Flash memory
(1024/2048/4096 × 8 bits)
03FFH/
07FFH/
0FFFH
0000H
0080H
OSCSEL0 LIOSP
1
ENPU34
<R>