M306V2 Mitsubishi, M306V2 Datasheet - Page 33

• Manufacturer Part Number: M306V2
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

Rev. 1.0
Figure 2.4.7 Bus-using priorities
Table 2.4.7 Microcomputer status in hold state
Table 2.4.8 External bus status when the internal area is accessed
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Oscillation
R/W signal, address bus, data bus, CS, BHE
Programmable I/O ports
HLDA
Internal peripheral circuits
ALE signal
Item
Address bus
Data bus
RD, WR, WRL, WRH
BHE
CS
ALE
___
(6) Hold signal
(7) External bus status when internal area is accessed
(8) BCLK output
The hold signal is used to transfer the bus privileges from the CPU to the external circuits. Inputting “L”
to the HOLD pin places the microcomputer in the hold state at the end of the current bus access. This
status is maintained and “L” is output from the HLDA pin as long as “L” is input to the HOLD pin. Table
2.4.7 shows the microcomputer status in the hold state.
Bus-using priorities are given to HOLD, DMAC, and CPU in order of decreasing precedence.
Table 2.4.8 shows the external bus status when the internal area is accessed.
The output of the internal clock can be selected using bit 7 of the processor mode register 0 (address
0004
Note: Before attempting to change the contents of the processor mode register 0, set bit 1 of the
16
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protect register (address 000A16) to “1”.
) (Note). The output is floating when bit 7 is set to “1”.
When read
When write
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
Item
SFR accessed
Address output
Floating
Output data
RD, WR, WRL, WRH output
BHE output
Output "H"
Output "L"
P0, P1, P2, P3, P4, P5
P6, P7, P8, P9, P10
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__________
__________
HOLD > DMAC > CPU
_______
__________
ON
Floating
Floating
Maintains status when hold signal is received
Output “L”
ON (but watchdog timer stops)
Undefined
Internal ROM/RAM accessed
Maintain status before accessed
address of external area
Floating
Undefined
Output "H"
Maintain status before accessed
status of external area
Output "H"
Output "L"
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
M306V2ME-XXXFP
Status
M306V2EEFP
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