Kenwood TH-K2AT Service Manual page 12

TH-K2AT/K2E/K2ET
Key and Encoder Input Circuit
The POWER key is assigned to the interrupt port (pin 95) of
the M PU.
The PTT key is assigned to the dedicated port (pins 13, 14)
of the M PU.
16 key (K, K2, M , M 2 and E3 types)
KIN0
1
4
7
∗
4 key (E type)
KIN0
F
12
CIRCUIT DESCRIPTION
KIN1 KIN2 KIN3 KIN4 KOUT0 KOUT1 KOUT2 KOUT3 PWRSW
2 3 F MENU
5 6 VFO LAMP
8 9 M R MONI
0 # CALL SET
KIN1 KIN2 KIN3 KIN4 KOUT0 KOUT1 KOUT2 KOUT3
VFO M R CALL MENU
LAMP
MONI
SET
Fig. 14 Key and Encoder input circuit
Other keys composes a matrix and key presses are detected
by scanning them by softw are.
The encoder reads data using the interrupt port (pins 35
and 36) of the M PU.
IC8
M PU
PTTI
95 14
POWER S7
SW
IC8
M PU
PWRSW PTTI
95 14
POWER S7
SW
PTTE ENCB ENCA
13 36 35
ROTARY
ENCODER
J3
PTTE ENCB ENCA
13 36 35
ROTARY
ENCODER
J3