M306V2ME Datasheet, PDF (38/276 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M306V2ME-XXXFP
M306V2EEFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
2.5.2 OSD Oscillation Circuit
The OSD clock oscillation circuit can obtain simply a clock for OSD by connecting an LC oscillator or a
ceramic resonator (or a quartz-crystal oscillator) across the pins OSC1 and OSC2. Which of LC oscillator
or a ceramic resonator (or a quartz-crystal oscillator) is selected by setting bits 1 and 2 of the clock control
register (address 020516).
Microcomputer
OSC1 OSC2
L
C1
C2
Figure 2.5.3 OSD clock connection example
2.5.3 Clock Control
Figure 2.5.4 shows the block diagram of the clock generating circuit.
XCIN
CM04
XCOUT
RESET
Software reset
CM10 “1”
Write signal
SQ
R
Interrupt request
level judgment
output
SQ
WAIT instruction
R
Sub clock
XIN
XOUT
Main clock
CM05
CM02
1/32 ^fC32
fC
f1
fAD
f8
f32
f1SIO2
f8SIO2
f32SIO2
bc
a _Divider d CM07=0
fC
CM07=1
BCLK
CM0i : Bit i at address 000616
CM1i : Bit i at address 000716
WDCi : Bit i at address 000F16
b
c
a
1/2
1/2
1/2
1/2
1/2
CM06=1
CM06=0
CM17,CM16=10
CM06=0
CM17,CM16=11
d
CM06=0
CM17,CM16=01
CM06=0
CM17,CM16=00
Details of divider
Figure 2.5.4 Clock generating circuit
Rev. 1.0
38