3-18
PCS-1500/1500P
[SIRCS block]
Fig. 3-10 SIRCS Block & Connecting with Bus
The SIRCS block consists of the selector circuit (IC781, IC782) that selects the received SIRCS signal
from either the camera (PCS-C150/C150P) or the RX-47 board, and the microcontroller that decodes the
selected received SIRCS signal and encodes (with modulating by the carrier wave) the SIRCS signal to be
transmitted from IR-OUT (refer to Fig. 3-10). Because the microprocessor (IC780) has only a general-
purpose port, it cannot be connected directly to the CPU bus. The microcontroller (IC780) is connected
to the CPU bus indirectly by connecting it to the I/O port of TDM-ASIC (IC750 of NETIF block). The
interrupt signal is latched inside IC110 (CPU block) so that the level triggered interrupt are realized.
The operating clock (4 MHz) of the microcontroller (IC780) is generated by the crystal oscillator (X780).
The SIRCS block is reset by the “RES_ALL” signal that is supplied from the CPU block.
It operates on the
+
5 V power supply voltage.
HD
7-0
HA
3-0
\HCS
\HRD
\HWE
Port-A
7-0
Port-D
Port-C
7-0
Port-B
Port-F
P0D
3-0
P0E
2
INT
P0C
3-0
P0E
0
P0B
3-0
P0A
3-0
P0E
1
P0E
3
REM
\STROBE,DECDAT
REQUEST
ENCDAT
STATUS
DECSET
\HCS_TDM
to IR OUT
SIRCS IN
from Camera
from RX-47 board
Port-E
7
0
1
Q
Clear
SIRCS Interrupt
Read "0400000Ah"
TDM ASIC(IC750)
uPD65646GJ-171
8
HA1-4
\HRD
\HWR
HD0-7
\IRQ_SIR
Internal Circuit of IC110
SIRCS Encoder/Decoder(IC780)
uPD17216GT-560
8
8
4
from/to
CPU BLOCK
Selector Circuit(IC781,782)
\RESET
\RESET
\WDOUT
\RES_ALL
3-2. Circuit Description of the Respective Boards
Summary of Contents for PCS-1500
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