TMP86CS49FG datasheet(236/252 Pages) TOSHIBA

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Page 222

18. Key-on Wakeup (KWU)

18.3 Function

TMP86CS49FG

Also, each level of the STOP0 to STOP3 pins can be confirmed by reading corresponding I/O port data register,

check all STOP0 to STOP3 pins "H" that is enabled by STOPCR before the STOP mode is started (Note2,3).

Note 1: When the STOP mode released by the edge release mode (SYSCR1<RELM> = “0”), inhibit input from STOP0 to

STOP3 pins by Key-on Wakeup Control Register (STOPCR) or must be set "H" level into STOP0 to STOP3 pins

that are available input during STOP mode.

Note 2: When the STOP pin input is high or STOP0 to STOP3 pins input which is enabled by STOPCR is low, executing an

instruction which starts STOP mode will not place in STOP mode but instead will immediately start the release

sequence (Warm up).

Note 3: The input circuit of Key-on Wakeup input and Port input is separated, so each input voltage threshold value is dif-

ferent. Therefore, a value comes from port input before STOP mode start may be different from a value which is

detected by Key-on Wakeup input (Figure 18-2).

Note 4: STOP pin doesn’t have the control register such as STOPCR, so when STOP mode is released by STOP0 to

STOP3 pins, STOP pin also should be used as STOP mode release function.

Note 5: In STOP mode, Key-on Wakeup pin which is enabled as input mode (for releasing STOP mode) by Key-on

Wakeup Control Register (STOPCR) may generate the penetration current, so the said pin must be disabled AD

conversion input (analog voltage input).

Note 6: When the STOP mode is released by STOP0 to STOP3 pins, the level of STOP pin should hold "L" level (Figure

18-3).

Figure 18-2 Key-on Wakeup Input and Port Input

Figure 18-3 Priority of STOP pin and STOP0 to STOP3 pins

Table 18-1 Release level (edge) of STOP mode

Pin name

Release level (edge)

SYSCR1<RELM>="1"

(Note2)

SYSCR1<RELM>="0"

STOP

"H" level

Rising edge

STOP0

"L" level

Don’t use (Note1)

STOP1

"L" level

Don’t use (Note1)

STOP2

"L" level

Don’t use (Note1)

STOP3

"L" level

Don’t use (Note1)

Port input

External pin

Key-on wakeup

input

STOP pin

a) STOP

Release

STOP mode

STOP pin "L"

Release

STOP mode

In case of STOP0 to STOP3

STOP0 pin

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