tc94a58fg TOSHIBA Semiconductor CORPORATION, tc94a58fg Datasheet - Page 6

• Manufacturer Part Number: tc94a58fg
• Description: Single-chip Cd Processor With Built-in Controller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Pin Functions
Pin
No.
49
50
51
/MXI/SYSCK
Symbol
RESET
(BRK1)
/DACin
(BRK2)
/MXO
P8-0
P8-1
/1-bit DAC data input
/crystal oscillator
/CPU clock input
/crystal oscillator
Reset input
I/O port 8-0
I/O port 8-1
Pin Name
System reset input pin for the device.
A reset is applied while the RESET signal is low.
When it is high, the 16.9344-MHz crystal
oscillator (XI, XO) starts operating. The
controller counts clock pulses from this oscillator
and waits a specified standby time
(approximately 50 ms) before starting the
controller program from address 0. The CD
processor is placed in the standby state at this
time.
Normally, raising the voltage on MVDD from 0
to 1.8 V or higher triggers a system reset
(power-on reset) so that the RESET pin should
be held at high.
2-bit CMOS I/O port.
Input/output can be specified for each bit. When
the pins are used as I/O port input, each pin can
be pulled up or down by program. When backup
release for clock stop mode or wait mode is
enabled for the pins, a change in a pin can
release the backup state.
The program can set these pins to be used for a
75-kHz or 32.768-kHz dedicated crystal
oscillator. The P8-0 pin can also be used to
accept an external CPU operating clock input
(SYSCK). The P8-1 pin can also be used to
accept data for the 1-bit DAC (DACin) when a
CD command is executed.
The 75-kHz or 32.768-kHz dedicated crystal
oscillator and CPU clock input are used for the
operation of the controller and peripheral
devices. Upon a system reset, the 16.9344-MHz
crystal oscillator (XI, XO) is selected as the
clock for controller and peripheral device
operation. The program can subsequently set
the pins to oscillator pins and switch the clock
generated from the oscillator to the controller
clock. When the pins are used for an oscillator,
executing the CKSTP instruction causes its
oscillation to stop.
(Note) When the P8-0 pin is used for a CR
(Note) Backup release is enabled for both pins
(Note) Use a crystal oscillator having a good
(Note) Upon a system reset, the pins are set to
(Note) After setting the pins to oscillator pins,
(Note) For an external CPU clock, usually use
oscillator, the P8-1 pin can used as an
I/O port pin.
simultaneously.
startup characteristic.
I/O port input.
wait until oscillation settles before
switching the controller clock.
a 32.768-kHz clock. The pin has CMOS
input configuration.
Function and Operation
6
(When used for crystal oscillator)
instructio
(When used for I/O port)
MXO
MXI
MV
Input
DD
R
IN1
Remarks
TC94A58FG
MV
R
MV
R
fXT2
out2
2005-12-7
SS
SS
MV
MV
MV
MV
SS
MV
DD
DD
DD
DD