Toshiba TLCS-900/L1 Series Manual page 28

(2) Reduced drivability for low-frequency oscillator
(Purpose)
Reduces noise and power for oscillator when a resonator is used.
(Block diagram)
XT1 pin
C1
Resonator
C2
XT2 pin
(Setting method)
The drivability of the oscillator is reduced by writing 0 to the EMCCR0
<DRVOSCL> register. By reset, <DRVOSCL> is initialized to 1.
(3) Single drive for high-frequency oscillator
(Purpose)
Not need twin-drive and protect mistake operation by inputted noise to X2 pin
when the external-oscillator is used
(Block diagram)
X1 pin
X2 pin
(Setting method)
The oscillator is disabled and starts operation as buffer by writing 1 to
EMCCR0<EXTIN> register. X2 pin is always outputted 1.
By reset, <EXTIN> is initialized to 0.
Note: Do not write EMCCR0<EXTIN> = "1" when using external resonator.
Enable oscillation
EMCCR0<DRVOSCL>
f
S
.
f
OSCH
Enable oscillation (STOP + EMCCR0<EXTIN>)
EMCCR0<DRVOSCH>
91C824-26
TMP91C824
2008-02-20