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Renesas PCA7429G02 Informations techniques Page 73

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70
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37272M6/M8–XXXSP/FP, M37272MA–XXXSP
M37272E8SP/FP, M37272EFSP
MITSUBISHI MICROCOMPUTERS
Rev. 1.3
b7 of raster color
register
OSD control
register
I/O
Port
1
1
0
8.11.3 Clock for OSD
As a clock for display to be used for OSD, it is possible to select one
of the following 3 types.
• Data slicer clock output from the data slicer (approximately 26 MHz)
• OSC1 clock supplied from the pins OSC1 and OSC2
• Clock from the ceramic resonator or the LC oscillator from the pins
OSC1 and OSC2
This OSD clock for each block can be selected by the following bits
: bit 7 of the raster color register (address 00D9
16), bits 3 to 6 of the
clock source control register (addresses 00D0
16). A variety of char-
acter sizes can be obtained by combining dot sizes with OSD clocks.
When not using the pins OSC1 and OSC2 for the OSD clock I/O
pins, the pins can be used as sub-clock I/O pins or port P2.
Fig. 8.11.12 Block Diagram of OSD Selection Circuit
Table 8.11.2 Setting for P26/OSC1/XCIN, P27/OSC2/XCOUT
OSD clock
I/O Pin
0
1
0
Sub-clock
I/O Pin
0
0
0
Function
Register
b6
b5
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