FX803 Datasheet, PDF (5/17 Pages) Sanyo Semicon Device – DC-DC Converter

Controlling Protocol
Control of the FX803 Audio Signalling Processor's operation is by communication between the µController and the FX803
internal registers on the “C-BUS,” using Address/Commands (A/Cs) and appended instructions or data (see Figure 7). The use
and content of these instructions is detailed in the following paragraphs and tables.
FX803 Internal Registers
FX803 internal registers are detailed below:
Control Register (30_H) – Write Only, control and
configuration of the FX803.
Status Register (31 ) – Read Only, reporting of device
H
functions.
Rx Tone Frequency Register (32_H) – Read Only, indicates
frequency of the last received input.
Rx
NOTONE
Timer
Register
(33 )
H
–
Write Only, setting of the
Rx NOTONE period.
Tx Tone Generator 1 Register (34 ) – Write Only, setting
H
the required output frequency from Tx Tone Generator 1.
Tx Tone Generator 2 Register (35 ) – Write Only, setting
H
required output frequency from Tx Tone Generator 2.
General Purpose Timer Register (36 ) – Write Only,
H
setting of a general purpose, sequential time period.
Address/Commands
The first byte of a loaded data sequence is always
recognized by the “C-BUS” as an Address/Command (A/C)
byte. Instruction and data transactions to and from this
device consist of an Address/Command byte followed by
either:
(i) further instructions or data or,
(ii) a Status or data Reply.
Instructions and data are loaded and transferred, via
“C-BUS,” in accordance with the timing information given in
Figures 7 and 8.
Table 1 shows the list of A/C bytes relevant to the FX803.
A complete list of DBS 800 “C-BUS” Address allocations is
published in the System Support Document.
Command
Assignment
Address/Command (A/C) Byte +
Hex.
Binary
MSB
LSB
General Reset
Write to Control Register
Read Status Register
Read Rx Tone Frequency
Write to NOTONE Timer
Write to Tx Tone Gen. 1
Write to Tx Tone Gen. 2
Write to G/Purpose Timer
01
00000001
30
00110000 +
31
00110001 +
32
00110010 +
33
00110011 +
34
00110100 +
35
00110101 +
36
00110110 +
Table 1 “C-BUS” Address/Commands
Data
Byte/s
1 byte Instruction to Control Register
1 byte Reply from Status Register
2 byte Reply from Rx Tone Register
1 byte Instruction to NOTONE Register
2 byte Instruction to Tx Tone Gen. 1
2 byte Instruction to Tx Tone Gen. 2
1 byte Instruction to G/Purpose Timer
0
1000
2000
3000
4000
(Tx) TONE GENERATORS 1 and 2
1250Hz to 6000Hz
((RRxx))HHIGIGHHBBAANNDD
(Rx) MID BAND
313Hz to 1500Hz
208Hz to 3000Hz
(Rx) EXTENDED BAND
625Hz to 3000Hz
0
1000
2000
3000
4000
Fig.4 FX803 Frequencies
5
5000
6000
Frequency (Hz)
Frequency (Hz)
5000
6000