Toshiba TC9314F Manual page 5

Pin No. Symbol
P3-0/DA I/O port 3
OUT
/D/A analog voltage
output
P3-1/AD /A/D analog voltage
IN2
input
54~57
P3-2/AD /A/D analog voltage
IN1
input
P3-3/ /reference voltage
DC-REF input
P4-0/SI I/O port 4
/serial data input
P4-1/SO /serial data output
58~61
P4-2/ SCK /serial clock
input/output
P4-3 I/O port 4
General-purpose
62 OT1/BUZR output port
/buzzer output
63 MUTE Muting output port
64 INTR1
External interrupt
input
65 INTR2
Pin Name
4 bit I/O port.
Input or output can be programmed for each bit.
Pins P3-0 through P3-2 serve as the analog inputs
and outputs for the built-in A/D and D/A
converters.
The A/D converter operates by successive
comparison method based on software control.
Pins can be set to A/D, D/A analog input/output in
units of bits as necessary.
P3-3 can be set to reference voltage input.
Reference voltage can be set to the internal
supply voltage (V
V to the A/D analog input, enabling
EED
measurement of battery voltage and the like.
The D/A converter outputs analog voltage through
the operating amplifier with shared the
comparison voltage generator circuit used by the
A/D converter. To share the reference voltage
generator circuit with the A/D converter, D/A
converter output is set to high impedance during
A/D conversion. It is necessary at such times to
connect an analog voltage hold capacitor to the
D/A output pin.
The A/D and D/A converters, as well as their
controls, are all programmable.
4 bit I/O port.
Input or output can be programmed for each bit.
Pins P4-0 through P4-2 also serve as input/output
pins for the serial interface circuit (SIO).
SIO inputs 4 bit or 8 bit serial data at the clock
edge of the SCK pin; outputs data from the SO
pin.
The serial operating clock ( SCK ) allows selection
between internal and external, and between rising
and falling clock edge shift. The SO pin can be
switched to serial input (SI), facilitating control of a
variety of LSIs and communication between
controllers. All SIO inputs have built-in
Schmittcircuits.
All SIOs and their controls can be used or set by
program.
1 bit output port that also serves as the built-in
buzzer circuit output. Buzzer buzzes in 254 levels
from 18.75 kHz to 147 Hz, with a duty factor of
50%.
Buzzer output control can be used or set by
program.
1 bit output port.
Normally used for output of the muting control
signal. It allows the internal MUTE bit to be set to
1 based on I/O port 1 input state. It can also
change MUTE bit output logic and output PLL
phase differences.
External interrupt input pins.
Can be used for remote control signal input or
tape travel detection input.
Can also be programmed as general-purpose
input ports.
Function and Operation
). It is also possible to input
DD
5
TC9314F
Remarks
2003-07-03