
TC93P27F
2002-11-18
7
Pin No.
Symbol
Pin Name
Function and Operation
Remarks
50~61
P4-0/
PWM
P4-1
P6-2/CTR
IN1
P6-3/CTR
IN2
I/O port 4
/PWM output
I/O port 4
I/O port 6
/Counter input
16-bit I/O ports, allowing input and output to be
programmed in 1-bit units.
The P4-0 pin is also used for built-in 12-bit PWM
outputs. The PWM outputs pulse continuously at
73.26 Hz, and can change the duty of the pulses to
256 steps (8 bits), causing the added pulses to be
output using 4 bits for 16 cycles (218.5 ms).
The P6-2 and P6-3 pins are also used for input
purposes when using 20-bit IF counters as 12-bit
and 8-bit binary counters.
The P6-2 pin can be used for 12-bit binary counter
inputs, and the P6-3 pin for 8-bit binary counter
inputs.
PWM outputs, counter inputs, and all associated
controls can be programmed.
62
MUTE
Muting output port
1-bit output port, normally used for muting control
signal output.
This pin can set the internal MUTE bit to “1”
according to a change in the input of I/O port 1.
MUTE bit output logic can be changed: PLL phase
difference can also be output using this pin.
63
TEST
Test mode control
input
Input pin used for controlling TEST mode.
“H” (high) level indicates TEST mode, while “L”
(low) indicates normal operation.
The pin is normally used at low level or in NC (no
connection) state. (a pull-down resistor is builtin).
64
IF
IN
/IN1/
SC
IN
IF signal input
/Input port
/Cycle measurement
input
IF signal input pin for the IF counter to count the IF
signals of the FM and AM bands and to detect the
automatic stop position.
The input frequency is between 0.35 to 12 MHz
(0.2 Vp-p min). A built-in input amp. and C coupling
allow operation at low-level input.
The IF counter is a 20 bit counter with optional gate
times of 1, 4, 16 and 64 ms. 20 bits of data can be
readily stored in memory. This counter is used as a
timer when the IF counter is not used.
The input pin can be programmed for use as an
input port (IN port). CMOS input is used when the
pin is set as an IN port.
Note: To set SC
IN
, use the pin with DC coupling
and rectangular wave input.
65
66
DO1/OT2
DO2
Phase comparator
output
/Output port
Phase comparator
output
PLL phase comparator output pins.
When the prescaler output of the programmable
counter is higher than the reference frequency,
output is at high level. When output is lower than
the reference frequency, output is at low level.
When output equals the reference frequency, high
impedance output is obtained. Because DO1 and
DO2 are output in parallel, optional filter constants
can be designed for the FM/VHF and AM bands.
Pin DO1 can be programmed to high impedance or
programmed as an output port (OT2). Thus, the
pins can be used to improve lock-up time or used
as output ports.
(P6-2, P6-3)
R
IN2
R
fIN2
(P4-0 to P6-1)
Input
instructio
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