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M306V5ME-XXXSP Datasheet(PDF) 29 Page - Mitsubishi Electric Semiconductor

Part No. M306V5ME-XXXSP
Description  SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
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Maker  MITSUBISHI [Mitsubishi Electric Semiconductor]
Homepage  http://www.mitsubishichips.com
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M306V5ME-XXXSP Datasheet(HTML) 29 Page - Mitsubishi Electric Semiconductor

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M306V5ME-XXXSP
M306V5EESP
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
29
Rev. 1.0
The following paragraphs describes the clocks generated by the clock generating circuit.
(1) Main clock
The main clock is generated by the main clock oscillation circuit. After a reset, the clock is divided by
8 to the BCLK. The clock can be stopped using the main clock stop bit (bit 5 at address 000616).
After the oscillation of the main clock oscillation circuit has stabilized, the drive capacity of the main
clock oscillation circuit can be reduced using the XIN-XOUT drive capacity select bit (bit 5 at address
000716). Reducing the drive capacity of the main clock oscillation circuit reduces the power dissipa-
tion. This bit changes to “1” when shifting from high-speed/medium-speed mode to stop mode and at
a reset.
(2) BCLK
The internal clock
φ is the clock that drives the CPU, and is the clock derived by dividing the main
clock by 1, 2, 4, 8, or 16. The BCLK is derived by dividing the main clock by 8 after a reset.
The main clock division select bit 0 (bit 6 at address 000616) changes to “1” when shifting from high-
speed/medium-speed to stop mode and at reset.
(3) Peripheral function clock (f1, f8, f32, f1SIO2, f8SIO2, f32SIO2, fAD)
The clock for the peripheral devices is derived by dividing the main clock by 1, 8 or 32. The peripheral
function clock is stopped by stopping the main clock or by setting the WAIT peripheral function clock
stop bit (bit 2 at 000616) to “1” and then executing a WAIT instruction.


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