tmp88cs38ng TOSHIBA Semiconductor CORPORATION, tmp88cs38ng Datasheet - Page 189

• Manufacturer Part Number: tmp88cs38ng
• Description: Cmos 8-bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.15.5.8.2 Notes on Creating a Software Program
(1) If you want to change the OSD display screen, rewrite the same value to ORCLKC
(2) When the content of the OSD screen is displayed for a long time, the OSD display
(3) The clock generator for OSD display does not stop oscillating even in STOP mode.
for adjustment of . the oscillating frequency.
position deviates because the oscillating frequency changes according to the power
supply voltage and temperature characteristics. To adjust the deviation, monitor
the oscillating frequency error using ORCLKF, then rewrite the value before
adjustment to ORCLKC during OSD screen off.
timing of writing a setting value to ORCLKC into consideration.
If you want to stop it, write 00H to ORCLKC.
Example)
When the read value is FFH, it turns out that the display clock frequency is in a
setting value. However, depending on temperature, power supply voltage, and OSD
oscillation frequency, the lower 3 bits of ORCLKF may not be in agreement (the
maximum difference of the lower 3 bits value is “5”), then the display clock frequency
may become lower than a setting value. Please setup the oscillation frequency
which has a margin in the composition of a display screen in consideration of these
characteristics.
clock frequency is required the time of 256 scanning lines at maximum.
oscillation frequency may become higher rapidly. In order to slip out of this state, a
resetup of ORCLKC is required. Please repeat a resetup of ORCLKC until the higher
5 bits of the ORCLKF or more bits are in agreement. Please write in the ORCLKC at
timing of the OSD display period (near the center of the OSD display period is
recommended) of a horizontal synchronizing signal, or please write in the ORCLKC
two or more times.
In this case, the OSD display position deviates (Refer to Note 1), please take the
HD
By reading ORCLKF, the status of a display clock frequency can be monitored.
The period from the ORCLKC writing to the completion of a setting of a display
When the ORCLKC is resetup in order to change OSD oscillation frequency, OSD
When the OSD display screen is ON.
When the content of the OSD screen is all changed.
When OFF command is received while CCD is displayed.
88CS38-189
ORCLKC write timing
OSD display period
TMP88CS38/CM38A/CP38A
2007-09-12