4571 datasheet(45/126 Pages) RENESAS

45 / 126 page

Rev.1.02

May 25, 2007

Page 45 of 124

REJ03B0179-0102

4571 Group

(4) Return signal

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

up mode because the oscillation is stopped. Table 20 shows the

return condition for each return source.

(5) Control registers

• Key-on wakeup control register K0

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

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 K1 to register A.

• Key-on wakeup control register K2

function. 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 L1

pin return condition and INT0 pin key-on wakeup function and

the selection of the INT1 pin return condition and INT1 pin

key-on wakeup function. Set the contents of this register

through register A with the TL1A instruction. In addition, the

TAL1 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.

• Interrupt control register I1

and the input control of INT0 pin. Set the contents of this

addition, the TAI1 instruction can be used to transfer the

contents of register I1 to register A.

Table 20 Return source and return condition

Return source

Return condition

Remarks

Port P00

−P03

Port P10

−P13

Port P20, P21

Port K

Return by an external falling edge (“H”

→ “L”)

input.

The key-on wakeup function can be selected by

one port unit. Set the port using the key-on

wakeup function to “H” level before going into

the RAM back-up state.

INT pin

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

or falling edge (“H”

→ “L”) or rising edge (“L” →

“H”).

When the return level is input, the EXF0 flag is

not set.

The key-on wakeup function can be selected by

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

“H” level) with the register I1 and return condition

(level or edge) with the register L1 according to

the external state before going into the RAM

back-up state.

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