4553 datasheet(53/145 Pages) RENESAS

53 / 145 page

Rev.3.02

Dec 22, 2006

page 53 of 142

REJ03B0024-0302

4553 Group

(6) Return signal

An external wakeup signal or timer 3 interrupt request flag (T3F) is

used to return from the clock operating mode.

An external wakeup signal is used to return from the RAM back-up

mode because the oscillation is stopped.

Table 16 shows the return condition for each return source.

(7) Control registers

• Key-on wakeup control register K0

tion. Set the contents of this register through register A with the

TK0A instruction. In addition, the TAK0 instruction can be used to

transfer the contents of register K0 to register A.

• Key-on wakeup control register K1

valid waveform/level of port P1. Set the contents of this register

through register A with the TK1A instruction. In addition, the TAK1

instruction can be used to transfer the contents of register K0 to

• Key-on wakeup control register K2

selection of return codition. Set the contents of this register

through register A with the TK2A instruction. In addition, the TAK2

instruction can be used to transfer the contents of register K2 to

Table 16 Return source and return condition

Remarks

Return condition

Return source

Ports P00–P03

Ports P10–P13

INT pin

• Pull-up control register PU0

tor. Set the contents of this register through register A with the

TPU0A instruction. In addition, the TAPU0 instruction can be

used to transfer the contents of register PU0 to register A.

• Pull-up control register PU1

tor. Set the contents of this register through register A with the

TPU1A instruction. In addition, the TAPU1 instruction can be

used to transfer the contents of register PU1 to register A.

• External interrupt control register I1

rupt, the input control of INT pin and the return input level. Set

the contents of this register through register A with the TI1A in-

struction. In addition, the TAI1 instruction can be used to transfer

the contents of register I1 to register A.

Return by an external falling edge

(“H”

→“L”).

Return by an external “H” level or “L”

level input, or rising edge (“L”

→“H”)

or falling edge (“H”

→“L”).

Return by an external “L” level input.

Return by an external “H” level or “L”

level input, or rising edge (“L”

→“H”)

or falling edge (“H”

→“L”).

When the return level is input, the in-

terrupt request flag (EXF0) is not set.

Return by timer 3 underflow or by

setting T3F to “1”.

It can be used in the clock operating

mode.

The key-on wakeup function can be selected by two port unit.

The key-on wakeup function can be selected by two port unit. Select the re-

turn level (“L” level or “H” level) and return condition (return by level or

edge) with register K1 according to the external state before going into the

power down state.

Select the return level (“L” level or “H” level) with register I1 and return con-

dition (return by level or edge) with register K2 according to the external

state before going into the power down state.

Clear T3F with the SNZT3 instruction before system enters into the power

down state.

When system enters into the power down state while T3F is “1”, system re-

turns from the state immediately because it is recognized as return

condition.

Timer 3 interrupt

request flag (T3F)

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