Toshiba H1 Series Data Book page 35

(2) Reduced drivability for low-frequency oscillator circuit
(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 circuit
(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
EMCCR0<DRVOSCH>
92CZ26A-32
TMP92CZ26A