Toshiba TLCS-900/H1 Series Data Book page 26

Example 1-Setting the clock
Changing from high frequency (fc) to low frequency (fs).
SYSCR0 EQU
SYSCR1 EQU
SYSCR2 EQU
LD
SET
SET
WUP: BIT
JR
SET
RES
(Note) "x" means don't care
"-" means no change
<XEN>
X1, X2 pins
<XTEN>
XT1, XT2 pins
Warming Up Timer
Counts up by f
End of Warming Up Timer
<SYSCK>
System Clock f
SYS
Enables
low Frequency
10E0H
10E1H
10E2H
(SYSCR2), 0X11−−XXB ;
6, (SYSCR0) ;
2, (SYSCR0) ;
2, (SYSCR0) ;
NZ, WUP ;
3, (SYSCR1) ;
7, (SYSCR0) ;
Counts up by fs
SYS
fc
Clears and starts
warming-up timer
92CH21 - 22
16
Sets warm-up time to 2 /fs.
Enables low-frequency oscillation.
Clears and starts warm-up timer.
Detects stopping of warm-up timer.
Changes f from fc to fs.
SYS
Disables high-frequency oscillation.
fs
Chages fsys
from fc to fs
End of warming up timer
TMP92CH21
Disabiles
high-frequency