4501_M datasheet(55/212 Pages) RENESAS

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1-43

4501 Group

HARDWARE

Rev.2.01

Feb 07, 2005

REJ09B0192-0201

(4) Return signal

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.

(5) Control registers

• Key-on wakeup control register K0

contents of this register through register A with the TK0A instruc-

tion. In addition, the TAK0 instruction can be used to transfer the

contents of register K0 to register A.

• Key-on wakeup control register K1

contents of this register through register A with the TK1A instruc-

tion. In addition, the TAK1 instruction can be used to transfer the

contents of register K0 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.

Table 16 Return source and return condition

Remarks

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.

Select the return level (“L” level or “H” level) with the bit 2 of register I1 ac-

cording to the external state before going into the RAM back-up state.

Return condition

Return by an external “L” level in-

put.

Return source

Port P0

Port P1 (Note)

Port P2

Ports D2/C, D3/K

Port P13/INT

(Note)

• Pull-up control register PU0

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

TPU0A instruction.

• Pull-up control register PU1

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

TPU1A instruction.

• Pull-up control register PU2

K pull-up transistor. Set the contents of this register through reg-

ister A with the TPU2A instruction.

• 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 “H” level or

“L” level input. The return level

can be selected with the bit 2

(I12) of register I1.

When the return level is input, the

EXF0 flag is not set.

Note: When the bit 3 (K13) of register K1 is “0”, the key-on wakeup of the INT pin is valid (“H” or “L” level).

It is “1”, the key-on wakeup of port P13 is valid (“L” level).

FUNCTION BLOCK OPERATIONS

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