- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
231
12.4. When Using the External Microcomputer
12.4.1. External Microcomputer-SS-HQ1 System Interface
System Composition
(Connection of External Microcomputer, DSP, and EEPROM)
Even if EEPROM is available for use with an external microcomputer, it cannot be used for reading and writing
in DSP (CXD3172AR) parameters via serial communication with the external microcomputer.
Be sure to include the DSP EEPROM in the serial communication line.
Fig 12.4-1 External Microcomputer-DSP EEPROM Interface
Connection Method
The wiring for each pin is given in the table below.
Table 12.4-1 CXD3172AR Wiring with a Microcomputer
Pin name
Pin Number
Description
SIFSEL 13
Low
XCS
15
Chip selection input
SI
16
Serial settings input
SO
17
Serial data output
SCK
18
Serial clock input
VD
Auxiliary signal (for communication timing control)
Output from S3 (Pin 48 S3SEL=3) or S4 (Pin 49 S4SEL=3)
EEPROM is connected to External-uCom
only
In this case,
DSP can not communicate to
EEPROM(Ext)
through External-uCom.
DSP
has the private EEPROM
SS-HQ1
External-
uCom
EEPROM
(External)
DSP
Without
EEPROM(DSP)
×
DSP parameters
Operation
External-
uCom
DSP
EEPROM
(DSP)
Operation
SS-HQ1