tc94a09f TOSHIBA Semiconductor CORPORATION, tc94a09f Datasheet - Page 12

• Manufacturer Part Number: tc94a09f
• Description: Single-chip Cd Processor With Built-in Controller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Number
19, 96
20, 95
Pin
93
94
Symbol
MV
MV
MXO
MXI
DD
SS
Power supply pins for
Crystal oscillator for
controller block
Pin Name
controller
Crystal oscillator pins for the controller.
The oscillator clock is used as a time base for
the clock function as well as the system clock
for the controller. After system reset, the CPU
starts operation using the 16.9344 MHz CD
oscillator (connected to the XI and XO pins).
The oscillator is switched to the controller
oscillator by program. Either a 4.5 MHz
reference oscillator or a 75 kHz oscillator is
connected to the MXO and MXI pins.
The oscillators are switched by a bit used to
select a frequency of 4.5 MHz or 75 kHz. The
oscillators incorporate a feedback resistor.
Switching frequencies automatically switches
the feedback resistor of the crystal oscillator.
75 kHz: R
4.5 MHz: R
If the operating clock is the CD crystal
oscillator, fix the MXI pin to GND.
During execution of the CKSTP instruction,
oscillation halts.
Selection and control of crystal oscillators are
done by program.
(Note) When the 75 kHz crystal oscillator is
Power supply pins for the controller block.
Normally, V
In backup state (when executing the CKSTP
instruction), current dissipation becomes low (1
mA or below), dropping the power supply
voltage to 2.0 V.
If 2.7 V or more is applied to these pins when at
0 V, a system reset is applied to the device and
the program starts from address 0 (power-on
reset).
(Note) At power-on reset operation, allow 10 to
used, externally add/connect a 100 kW
output resistor.
100 ms while the device power supply
voltage rises.
out2
out2
DD
Function and Operation
12
= 2 kW, R
= 4.5 to 5.5 V.
= 2 kW, R
fXT2
fXT2
= 10 MW typ.
= 1 MW typ.
MXO
MXI
Remarks
TC94A09F
2001-10-15
R
R
fXT2
MV
out2
DD
MV
MV
DD
SS