Fostex G16 - Page 17

Fig. 3.7 Ports of CPU Ul
STB (0)
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A strobe signal (LOW) will be output
when any switch is set to ON or OFF.
OFF ON OFF
STB _______
OUTPUT
2/js !
2 jus
---- 5V
---- ov
Vdd
9
Pin for power supply (+5V).
Vss
6
Ground pin.
OSC 1, 2
7, 8
The ceramic resonator connecting
pin for the CPU internal oscillator
clock (8 MHz).
RST (I)
2
Reset pin. Reset by LOW input.
3.3 Bargraph LED meter
The signal level of each channel are A/D coverted by CPU UI (NEC) on the Connector Board
and serial transmitted to the Controller. Upon receiving this serial data, CPU U2 (NEC) on the
Controller lights the bargraph LED meter in accordance to this data (Lighting is done by
dynamic scan).
Fig. 3.8 Overall Schematic
Explanation in this manual is in two parts —
1. A/D conversion section (Operation by UI on the Connector Board PCB) and
2. Bargraph LED meter lighting section (Operation by U2 on the Controller PCB)
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