PD178046_15 Datasheet, PDF (26/42 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER

SI3/P70
SO3/P71
SCK3/P72
µPD178046, 178048
Figure 3-10. Block Diagram of Serial Interface (SIO3)
Internal bus
8
Direction control circuit
8
Serial I/O shift
register 3 (SIO3)
Serial clock
counter
Serial clock
control circuit
Interrupt request
signal generation
circuit
Selector
INTCSI3
fX/2³
fX/2⁵
fX/2⁶
3.6 OSD Controller
OSD (On-screen display) is a function to display the channel number, volume, and time on the TV screen. User-
programmable display patterns for OSD are defied in the CROM (character ROM) area.
The patterns actually displayed are stored in VRAM (video RAM).
Figure 3-11. Block Diagram of OSD Controller
OSC1
OSC2
LC
oscillation
circuit
OSCMON/P74
Divider
Address specification
Video RAM
(VRAM)
Control data
HSYNC
VSYNC
Synchro-
nization
protection
circuit
Character ROM
(CROM)
Character pattern data
Output controller
R
G
B
BLACK
24
Preliminary Product Information