- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
201
*3. SYSSELFLG
SYSSELFLG is a detection flag used when the system is switched. The MODESEL and SGMODE values
are switched based on the value in this parameter.
SYSSELFLG is assigned to a port driver in order to use this parameter. The parameter value changes
according to whether the port input signal from the exterior is “High” or “Low”.
Table 12.2-18 SYSSELFLG Parameter
Parameter
Description
SYSSELFLG
CAT12_Byte13_bit2
System selection flag
*4. MODESEL0/1 and SGMODE0/1
These parameters preset the values to be applied to MODESEL and SGMODE based on the SYSSELFLG
value.
• If SYSSELFLG=0[h]
The MODESEL0 setting is applied to MODESEL, and the SGMODE0 setting is applied to SGMODE.
• If SYSSELFLG=1[h]
The MODESEL1 setting is applied to MODESEL, and the SGMODE1 setting is applied to SGMODE.
Table 12.2-19 MODESEL and SGMODE setting parameters
Parameter
Description
Notes
MODESEL0 CAT12_Byte16_bit0-7
MODESEL when SYSSELFLG=0[h]
(valid only when SYSSELON=1[h])
MODESEL1 CAT12_Byte17_bit0-7
MODESEL when SYSSELFLG=1[h]
(valid only when SYSSELON=1[h])
SGMODE0 CAT12_Byte18_bit0-7
SGMODE when SYSSELFLG=0[h]
(valid only when SYSSELON=1[h])
SGMODE1 CAT12_Byte19_bit0-7
SGMODE when SYSSELFLG=1[h]
(valid only when SYSSELON=1[h])
When using this
function, do not
assign SGMODE
to a port.
Also, do not
change the
SGMODE setting
through serial
communication.
Example system switching control parameter settings (for 760H NTSC)
In this example, the ECK-28MHz (MODESEL=6[h]) INT (SGMODE=0[h]) and ECK-27MHz (MODESEL=8[h])
LL (SGMODE=1[h]) systems are switched.
1. The MODESEL and SGMODE values assigned to port drivers are removed by the DSP initial signal.
2. SYSSELFLG is assigned to a port driver. (See
3. ECK-28MHz INT settings: MODESEL0 is set to ”6[h]” and SGMODE0 is set to ”0[h]”. (See
4. ECK-27MHz LL settings: MODESEL1 is set to ”8[h]” and SGMODE1 is set to ”1[h]”. (See
5. SYSSELON is set to ”1[h]”. (See
6. The system switches according to whether the input to the port driver where SYSSELFLG is assigned is
“High” or “Low”.If the port input is “High”, then LL mode is switched. If it is “Low”, then INT is switched.
* For information on port driver settings, see 10.1 “Port Driver Function”.
* This function performs a RESET operation each time the system is switched. Therefore, the settings must be
saved to EEPROM.