TK-8100
28
Control Circuit
The CPU carries out the following tasks:
1) Controls the WIDE, NARROW, TX/RX outputs.
2) Adjusts the AF signal level of the AF filter (IC251) and
turns the filter select compounder on or off.
3) Controls the display unit.
4) Controls the PLL (IC401).
5) Controls the D/A converter (IC161) and adjusts the vol-
ume, modulation and transmission power.
IC161
D/A
converter
IC401
PLL
IC101
CPU
LD
DT
CK
PLLE
EEPCK
IC101
CPU
IC66
EEPROM
EEPDT
EEPWP
Fig. 10 Control circuit /
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Fig. 11 Memory circuit /
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■
Memory Circuit
The transceiver has a 64k-bit EEPROM (IC66). The
EEPROM contains adjustment data. The CPU (IC101) con-
trols the EEPROM through three serial data lines.
■
Display Circuit
The CPU (IC101) controls the display LCD and LEDs.
When power is on, the CPU will use the MBL line to control
the LCD illumination and key backlight LEDs.
The dimmer function is controlled by the switch Q11. The
LCD controller (IC2) controls the functions of the LCD
through the CE, CK, DI lines from the CPU.
Q10
SW
Q6
SW
IC101
CPU
D2~D5
Q9
SW
D19~D26,
D28~D31
Q11
SW
IC2
LCD
controller
CE
CK
DI
MBL
COM0~
COM3
SEG0~
SEG30
DIM
LCD
Fig. 12 Display circuit /
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CIRCUIT DESCRIPTION /
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