Toshiba TC9457F - Manual (Page 6)

TC9457F
2002-10-21 6
Pin No. Symbol Pin Name Function And Operation Remarks
25
26~28
29
P3-0/DCREF
P3-1/ADIN1
~
P3-3/ADIN3
P4-0/ADIN4/
BUZR
I/O port 3
/AD analog
reference
voltage input
I/O port 3
/AD analog
voltage input
I/O port 4
/AD analog
voltage inputs
/Buzzer output
5-bit CMOS I/O ports.
These ports can be set for input or output bit for bit by a
program.
The P3-0 to P4-0 pins serve dual purposes as analog
inputs for the internal 6-bit 4-channel AD converters.
The internal AD converters can complete conversion in 6
instruction cycles using a successive approximation
method. The required pins can be set for AD analog input
bit for bit by a program. P3-0 can be set for reference
voltage input, and the internal power supply (MV
DD
) can
be used for this reference voltage.
The P4-0 pin serves dual purposes as a buzzer output
pin.
The buzzer output can be selected from 8 frequencies,
0.625 to 3 kHz. Each selected frequency can be output in
one of four modes: continuous, single, 10 Hz intermittent,
and 10 Hz intermittent at 1 Hz interval.
Whether or not to use and how to control the AD converter
and buzzer all can be set by a program.
Note 2: If P3-0 is set for reference voltage input, note that
although normally in a high-impedance state, this
input during AD conversion becomes a 10 kΩ
load, typ. Therefore, pay careful attention to the
output impedance that is input to this pin.
―
30
31
32
P4-1/S12
P4-2/S0/SI1
/SDA
P4-3/SCK
/SCL
I/O port 4
/Serial data
input
/Serial data
input /output
/Serial clock
input /output
3-bit CMOS I/O ports.
These ports can be set for input or output bit for bit by a
program.
These pins serve dual purposes as input or output pins for
the serial interface circuit (SI0).
The SI0 is a 2-wire/3-wire compatible serial interface.
4 or 8 bits of serial data, beginning with the MSB or LSB,
are serially output from the SO/SDA pin at each clock
edge on the SCK/SCL pin, and the data on SI1 or SI2 pin
is serially input to the device. The serial clock (SCK/SCL)
allows selection between the internal (450/225/150/75
kHz) and external sources and a selection of the active
edge, rise or fall. Moreover, since the clock and data can
be output via Nch open-drain outputs, various device
controls and communication between controllers can be
greatly facilitated.
When an SI0 interrupt is enabled, an interrupt is
generated at completion of SI0 execution and the program
jumps to address 4. This is effective when high-speed
serial communication is desired.
All inputs to SI0 contain a Schmitt trigger circuit.
Whether or not to use SI0 and how to control it all can be
set by a program.
―
33~38
TEST0
~
TEST5
Test mode
control inputs
Test mode control input pins.
The test mode is selected when these pins are set high
and normal operation is selected when they are low.
These pins normally must be held low or left open (NC)
when used for this purpose. (Pulldown resistors are
built-in).
―
39~42
/HSO/OT19
SPCK/OT20
SPDA/OT21
COFS/OT22
CD control
signal outputs
/output ports
CD control output pins.
· /HSO : Playback speed mode output.
High = normal speed;
Low = double speed.
· SPCK : Processor status signal readout
clock output (176.4 kHz)
· SPDA : Processor status signal output.
· COFS : Correction system frame clock output
(7.35 kHz).
These pins can be switched for output ports by a program.
―
43 DOUT Digital output pin. ―
44 SBSY
CD control
input/outputs Subcode block sync output pin. It outputs a high at the S1
position when subcode sync is detected.
―