TC94A09F Datasheet, PDF (12/19 Pages) Toshiba Semiconductor – Single-Chip CD Processor with Built-in Controller

Pin
Number
Symbol
93
MXO
94
MXI
Pin Name
Function and Operation
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.
Crystal oscillator for
controller
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_out2 = 2 kW, R_fXT2 = 10 MW typ.
4.5 MHz: R_out2 = 2 kW, R_fXT2 = 1 MW typ.
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
used, externally add/connect a 100 kW
output resistor.
TC94A09F
Remarks
MXO
MXI
R_out2
R_fXT2
MV_DD
19, 96
20, 95
MV_DD
MV_SS
Power supply pins for the controller block.
Normally, V_DD = 4.5 to 5.5 V.
Power supply pins for
controller block
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
100 ms while the device power supply
voltage rises.
MV_DD
MV_SS
12
2001-10-15