Fostex G16 - Page 12

MTO-O and MT1-0 are meter mode switching outputs and the above output signals are
applied to the CPU (UI: UPD78C12AGF) on the Connector Board PCB. ALL IN-0
output a HIGH level when in the ALL IN mode. TR-REC-0 outputs a HIGH level when
transport is in the REC mode.
15) OUTPUT PORTS: PORT 20 ~ 27 (U101-37 ~ 44)
Control output ports of the I/O expander IC, UI 02.
16) SPOT-LED-O (UI 01-48), EDIT-LED-0 (UI 01-47)
Output ports for the main unit SPOT LED and EDIT LED.
17) S-DATA-0 (U101-65), S-DATA-I (U101-62), S-CLK-0 (U101-67)
These are the communication ports for the Controller and external serial connectors
and are 8-bit synchronized serial ports.
18) TXD-0 (UI 01-61), RXD-I (UI 01-62), RTS-D (UI 01-64)
Asynchronous communication ports for the optional synchronizer.
3.1.2 I/O EXPANDER UI 02, M50782SP (Refer to circuit diagram for System Control)
1) PORTS of CPU, UI 01 and UI 02 are connected as follows:
U10
1
U10
2
P20
(pin 44)
------- R3
(pin 3)
P21
(pin 43) -------
------- R2
(pin 2)
Data port
P22
(pin 42)
-------- RI
(pin 40)
P23
(pin 41) -------
------- R0
(pin 39)
P24
(pin 40)
-------- S2
(pin 37)
Address port
P25
(pin 39)
-------- SI
(pin 36)
4-bit x 7 port add
ress
P26
(pin 38)
-------- SO
(pin 35)
of U102,0~7.
P27
(pin 37)
-------- STI
) (pin 6)
Strobe port (R0 ”
“ R3
data will be latched to
UI 02 port when level
is HIGH.
2 ) CHI ~CH16 (UI 02-15 ~ 30)
The SAFE/READY SELECTOR outputs. These are LOW active. When in the REC mode,
INDIV-INPUT mode or SPOT ERASE mode, the selected channel goes to LOW level.
3 ) ERS-0 (U102-34), REC-0 (U102-33), MUTE1-O (U102-32), MUTE2-0 (U102-31)
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