M30622ECTFP MITSUBISHI [Mitsubishi Electric Semiconductor], M30622ECTFP Datasheet - Page 36

• Manufacturer Part Number: M30622ECTFP
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Bus Control
Figure 1.12.3. Example of RD signal extended by RDY signal
Figure 1.12.4. Bus-using priorities
Table 1.12.5. Microcomputer status in hold state
Note 1: In M30623(80-pin package), P1, P4
__________
(6) Hold signal
Oscillation
R/W signal, address bus, data bus, CS, BHE
Programmable I/O ports
HLDA
Internal peripheral circuits
ALE signal
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 1.12.5
shows the microcomputer status in the hold state.
Bus-using priorities are given to HOLD, DMAC, and CPU in order of decreasing precedence.
___
__________
ing external pin, but are internally the above conditions.
In an instance of multiplexed bus
In an instance of separate bus
RD
CS
RDY
RD
CS
RDY
Note: In M30623(80-pin package), the CS
BCLK
BCLK
i
i
(i=0 to 3)
(i=0 to 3)
(Note)
(Note)
: Wait using RDY signal
: Wait using software
_____
Item
P0, P1, P2, P3, P4, P5
P6, P7, P8, P9, P10
__________
_____
__________
HOLD > DMAC > CPU
_______
Accept timing of RDY signal
__________
4
to P4
7
(CS0 to CS3) and P7
36
tsu
______
________
(RDY -
i
signal (i = 0 to 3) has no corresponding exte
Accept timing of RDY signal
BCLK
______
ON
Floating
Floating
Maintains status when hold signal is received
Output “L”
ON (but watchdog timer stops)
Undefined
)
tsu
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(RDY -
2
BCLK
to P7
)
5
Status
, P9
__________
Mitsubishi microcomputers
1
have no correspond-
M16C / 62T Group