HYT TC-700P, Service Manual

Page: 14 / 100

TC-700P Service Manual
14
CPU Pins
Pin
No.
Port Name Pin Name I/O Function Remarks
1 P94/DA1 APC/TV O
Automatic power control /RX
bandpass control.
Adjust APC and RX bandpass
through DA (0-5V).
2 P93/DA0 TONEO
DTMF/2-Tone/5-Tone/Beep/A
LARM output (DA generates
waveform).
Cannot output from the
speaker.
3 P92 NC
4 P91 NC
5 P90 TONE_IN I 2-Tone/5-Tone input decode
OPEN DRAIN
OUT
6 BYTE BYTE BYTE Grounded through a resistor
7 CNVSS CNVSS CNVSS
Pulled down in operating
mode; and pulled up during
programming
(PROG9)
8 P87/XCIN DC_SW O
TX transient control
H: disable TX PA;
L: enable TX PA.
9 P86/XCOUT SHIFT O Frequency shift
10 RESET RESET I Reset at low level (PROG8)
11 XOUT XOUT O
Crystal oscillator output
(connected to a crystal
oscillator)
12 VSS GND I Grounded (PROG7)
13 XIN XIN I
Crystal oscillator input
(connected to a crystal
oscillator)
14 VCC VCC I VCC (PROG1)
15 P85/NMI NMI NC
Connected to VCC through a
47K resistor
16 P84/INT2 AF_TCLK I AK2346MSK serial clock input
17 P83/INT1 AUX1 O
Programmable port used for
future development
18 P82/INT0 AF_RDF I
AK2346MSK RX detect
(RDF/FD)
19 P81 DTMF_SD I DTMF decode data input
20
P7_6/TA3O
UT
AFDT O
AK2346 TDATA (to send MSK
data)