SAA5250P 데이터 시트보기 (PDF) - Philips Electronics
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SAA5250P
Philips Electronics
SAA5250P Datasheet PDF : 35 Pages
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Philips Semiconductors
Interface for data acquisition and control
(for multi-standard teletext systems)
Product specification
SAA5250
FUNCTIONAL DESCRIPTION
Microcontroller interface
The microcontroller interface communicates with the CPU via the handshake signals DB7 − DB0, ALE, CS, RD, WR. The
microcontroller interface produces control commands as well as programming the registers to write their contents or read
incoming status/data information from the buffer memory. The details of the codes used to address the registers are
given in Table 2.
The CIDAC is ‘MOTEL’ compatible (MOTEL compatible means it is compatible with standard Motorola or Intel
microcontrollers). It automatically recognizes the microcontroller type (such as the 6801 or 8501) by using the ALE signal
to latch the state of the RD input. No external logic is required.
Table 1 Recognition signals
CIDAC
ALE
RD
WR
8049/8051
TIMING 1
ALE
RD
WR
6801/6805
TIMING 2
AS
DS, E, Φ 2
R/W
Table 2 CIDAC register addressing
CODES
R
1
1
1
1
1
1
1
1
0
0
0
0
W
0
0
0
0
0
0
0
0
1
1
1
1
CS
0
0
0
0
0
0
0
0
0
0
0
0
DB2
0
0
0
0
1
1
1
1
0
0
0
0
DB1
0
0
1
1
0
0
1
1
0
0
1
1
DB0
0
1
0
1
0
1
0
1
0
1
0
1
FUNCTION
write register R0
write register R1
write register R2
write register R3
write register R4
write register R5
write command register R6 (initialization command)
write register R7
read status
read data register
test (not used)
test (not used)
January 1987
6
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