4559 datasheet(56/148 Pages) RENESAS

56 / 148 page

Rev.1.04

Aug 23, 2007

Page 56 of 146

REJ03B0188-0104

4559 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 24 shows the return condition for each return source.

(7) Control registers

• Key-on wakeup control register K0

function. 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

addition, the TAK1 instruction can be used to transfer the

contents of register K0 to register A.

• Key-on wakeup control register K2

function and the selection of return condition of INT pin. 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 register A.

• Key-on wakeup control register K3

waveform/level of port P3. Set the contents of this register

through register A with the TK3A instruction. In addition, the

TAK3 instruction can be used to transfer the contents of

• Pull-up control register PU0

transistor. 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

transistor. 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.

• Pull-up control register PU2

transistor. Set the contents of this register through register A

with the TPU2A instruction. In addition, the TAPU2

instruction can be used to transfer the contents of register PU2

to register A.

• Pull-up control register PU3

transistor. Set the contents of this register through register A

with the TPU3A instruction. In addition, the TAPU3

instruction can be used to transfer the contents of register PU3

to register A.

• External interrupt control register I1

waveform/level of INT pin. Set the contents of this register

through register A with the TI1A instruction. In addition, the

TAI1 instruction can be used to transfer the contents of register

I1 to register A.

Table 24 Return source and return condition

Return source

Return condition

Remarks

Ports P00

−P03

Ports P10

−P13

Ports P20

−P23

Return by an external falling edge (“H”

→ “L”).

For ports P0 and P1, the key-on wakeup function

can be selected by two port unit, for port P2, it

can be selected by a unit.

Ports P30

−P33

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,

The key-on wakeup function can be selected by

two port unit. Select the return level (“L” level or

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

edge) with register K3 according to the external

state before going into the power down state.

INT pin

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 interrupt

request flag (EXF0) is not set.

Select the return level (“L” level or “H” level) with

edge) with register K2 according to the external

state before going into the power down state.

Timer 3 interrupt request flag

(T3F)

Return by timer 3 underflow or by setting T3F

to “1”.

It can be used in the clock operating mode.

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 returns from the state

immediately because it is recognized as return

condition.

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