Chapter 1 Overview
1-6 Option

1-6-1 ROM Option

The product equipped with this LSI or an EPROM with this LSI controls the oscillation
mode after resetting as well as the runaway-detection watchdog timer, using bits 2 to
0 of the last address of the built-in ROM.
Option bits
Figure 1-6 ROM Option ( Address:X'7FFF' )
22 Option
01243
NSSTRT
Watchdog timer cycle setting
WDSEL2
WDSEL1WDSEL2
PKG
SEL1
PKG
SEL2
567
Selection of oscillation mode
after resetting
SLOW mode
NORMAL mode
NSSTRT
0
1
fs/2
01
WDSEL1
0
1
fs/2
fs/2
16
18
20
Packages
SDIP042-P-0600
QFP044-P-1010
PKGSEL2
0
1
QFH048-P-0707
PKGSEL1
0
1