TMP86CS64AFG datasheet(34/202 Pages) TOSHIBA

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Page 24

2. Operational Descriptions

2.2 System Clock Controller

TMP86CS64AFG

Figure 2-7 Level-Sensitive Exit Mode

Note 1: After a warm-up period starts, the STOP mode is not reentered if the STOP pin input becomes

low or STOP5 to STOP2 becomes high again.

Note 2: To return to the level-sensitive exit mode after setting up the edge-sensitive exit mode, the exit

mode is not switched until the rising edge of the STOP pin input is detected.

(2) Edge-sensitive exit mode (RELM = 0)

In this mode, the STOP mode is exited at the rising edge of the STOP pin input. This mode is used

in applications where a relatively short program is run repeatedly at periodic intervals. This periodic

signal (i.e., a clock from a low-power consumption oscillator) is input input to the STOP pin. In the

edge-sensitive exit mode, the STOP mode is entered even if the STOP pin input is high. Disable the

STOP5 to STOP2 pin input with the key-on wake-up control register (STOPCR).

Figure 2-8 Edge-Sensitive Exit Mode

Example 2 :Entering the STOP mode from the NORMAL mode by the INT5 interrupt

PINT5:

TEST

(P2PRD) . 0

: To eliminate spurious noise, the STOP mode is not entered if the

P20 port input is set to high.

JRS

F, SINT5

: Sets the level-sensitive exit mode.

(SYSCR1), 01010000B

: IMF¨0

SET

(SYSCR1) . 7

: Enters the STOP mode.

SINT5:

RETI

Example :Entering the STOP mode from the NORMAL mode

: IMF¨0

(SYSCR1) , 10010000B

: Sets the edge-sensitive exit mode to enter the STOP mode

STOP pin

XOUT pin

NORMAL mode

Exit the STOP mode by hardware.

NORMAL mode

VIH

Warm-up

STOP mode

Detect the low level of the

STOP pin input by programming

and enter the STOP mode.

Whenever the STOP pin input is set

to high, the STOP mode is exited.

STOP pin

XOUT pin

NORMAL mode

VIH

Warm-up

STOP mode

Enter the STOP

mode by

programming.

Exit the STOP mode by hardware

at the rising edge of the STOP pin input.

NORMAL

mode

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