Kenwood 144MHz FM TRANSCEIVER K2E - Manual (Page 12)

TH-K2AT/K2E/K2ET
12
■ Key and Encoder Input Circuit
The POWER key is assigned to the interrupt port (pin 95) of
the MPU.
The PTT key is assigned to the dedicated port (pins 13, 14)
of the MPU.
SET CALL # 0 ∗
MONI MR 9 8 7
LAMP VFO 6 5 4
MENU F 3 2 1
KIN0 KOUT0 KOUT1 KOUT2 KOUT3 PWRSW
95
S7 POWER
SW
J3
ROTARY
ENCODER
KIN1 KIN2 KIN3 KIN4
IC8
MPU
PTTI
14
PTTE
13
ENCB
36
ENCA
35
SET
MONI
LAMP
MENU CALL MR VFO F
KIN0 KOUT0 KOUT1 KOUT2 KOUT3
95
S7
J3
KIN1 KIN2 KIN3 KIN4
IC8
MPU
PTTI
14
PTTE
13
ENCB
36
ENCA
35
PWRSW
POWER
SW
ROTARY
ENCODER
Other keys composes a matrix and key presses are detected
by scanning them by software.
The encoder reads data using the interrupt port (pins 35
and 36) of the MPU.
16 key (K, K2, M, M2 and E3 types)
Fig. 14 Key and Encoder input circuit
4 key (E type)
CIRCUIT DESCRIPTION