7733 datasheet(323/940 Pages) RENESAS

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STOP AND WAIT MODES

7733 Group User’s Manual

11–16

• When setting the signal output disable selection

bit to “1” in the microprocessor mode

• When setting the clock

output selection bit

to “0” in the memory expansion mode

Note 2: This bit’s value also affects the pin state in the stop mode.

(Refer to Figure 11.3.1.)

Setting of the output levels for the external bus and bus control signals (not including E)

Port P0 direction register (address 4 16)

Must be fixed to “FF16.”

Port P1 direction register (address 5 16)

Port P2 direction register (address 8 16)

Port P3 direction register (address 9 16)

Port P0 register (address 2 16)

Set output level by the bit which corresponds to each pin.

0: “L” level output

1: “H” level output

Port P1 register (address 3 16)

Port P2 register (address 6 16)

Port P3 register (address 7 16)

Setting of E signal’s output level (Setting of pin P4 2/

’s state)

Oscillation circuit control register 0 (address 6C 16)

Signal output disable selection bit (Note 3)

0: In the wait mode, pin E outputs “H” level.

Pin P42/

operates when system clock stop bit at wait state = “0” and

outputs “L” level when this bit = “1.”

1: In the wait mode, pin E outputs “L” level.

Pin P42/

outputs bit 2’s value of port P4 register.

Port function control register (address 6D 16)

Standby state selection bit (Note 2)

Setting of the standby state selection bit to “1”

Port P4 direction register (address C 16)

Port P4 register (address A 16)

0: “L” level output

1: “H” level output

WIT instruction is

executed.

Note 3: This bit’s value also affects the following:

• Output state of bus control signals and others after the wait mode is terminated (Refer to chapter

“12. CONNECTING EXTERNAL DEVICES.” )

• Pin state in the stop mode. (Refer to Figure 11.3.1.)

Furthermore, description of pin P4 2/

is applied only in the microprocessor mode.

• When setting the signal output disable selection

bit to “0” in the microprocessor mode

• When setting the clock

output selection bit to

“1” in the memory expansion mode

Note 1: This is applied only in the microprocessor mode.

In the memory expansion mode, it may be “0” or “1”

because the I/O port function is selected.

(Note 1)

11.4 Wait mode

Fig. 11.4.1 Output level setting example in wait mode (Memory expansion or Microprocessor mode)

1 1 1 1 1 1 1

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