tc94a29fag TOSHIBA Semiconductor CORPORATION, tc94a29fag Datasheet - Page 5

• Manufacturer Part Number: tc94a29fag
• Description: Single-chip Cd Processor With Built-in Controller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Pin Functions
No.
Pin
49
50
51
Symbol
RESET
(BRK1)
(BRK2)
/MXO
/OSC
P8-0
/MXI
P8-1
/crystal oscillator
/crystal oscillator
/CR 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 for a
CR oscillator. These clocks 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,
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.
Function and Operation
5
(When used for crystal oscillator)
instructio
R
(When used for I/O port)
MXO
MXI
TC94A29FAG/FB
MV
Input
DD
(When P8-0 is used
for CR oscillator)
R
C
IN1
OSC
Remarks
MV
2003-04-01
R
R
MV
fXT2
out2
SS
MV
SS
MV
MV
MV
MV
DD
SS
MV
DD
MV
MV
DD
DD
DD
DD
SS