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M37735S4LHP

16-BIT CMOS MICROCOMPUTER

Renesas Electronics 

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MITSUBISHI MICROCOMPUTERS

M37735S4LHP

16-BIT CMOS MICROCOMPUTER

PROCESSOR MODE

Only the microprocessor mode can be selected.

___

Figure 9 shows the functions of pins P00/CS0 — P47 in the

microprocessor mode.

Figure 10 shows external memory area for the microprocessor mode.

Access to the external memory is affected by the BYTE pin, the wait

bit (bit 2 of the processor mode register 0 at address 5E16), and the

wait selection bit (bit 0 of the processor mode register 1 at address

5F16) .

• BYTE pin

When accessing the external memory, the level of the BYTE pin is

used to determine whether to use the data bus as 8-bit width or 16-

bit width.

The data bus has a width of 8 bits when level of the BYTE pin is “H”,

and pins P20/A0/D0 — P27/A7/D7 are the data I/O pins.

The data bus has a width of 16 bits when the level of the BYTE pin is

“L”, and pins P20/A0/D0 — P27/A7/D7 and pins P10/A8/D8 — P17/A15/

D15 are the data I/O pins.

When accessing the internal memory, the data bus always has a

width of 16 bits regardless of the BYTE pin level.

7 654 321 0

Address

0

1 0 Processor mode register 0 5E16

7 654 3210

Address

Processor mode register 1 5F16

Wait selection bit

0 : Wait 0

1 : Wait 1

Must be “10” (“10” after reset)

Wait bit

0 : Wait

1 : No wait

Software reset bit

Reset occurs when this bit is set to “1”

Interrupt priority detection time selection bit

0 0 : Internal clock ! 7 (cycle)

0 1 : Internal clock ! 4 (cycle)

1 0 : Internal clock ! 2 (cycle)

Must be “0”

Not used

Fig. 8 Processor mode register bit configuration

10

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