TMP47P201 datasheet(15/32 Pages) TOSHIBA

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TMP47C101/201

Figure 2-19. Level-Sensitive Release Mode

b. Edge-sensitive release (clock) mode

In this mode, the hold operation is released at the ris-

ing edge of the HOLD pin input. This mode is used for

applications in which a relatively short-time program

processing is repeated at a certain cycle. This cyclic

signal (for example, the clock supplied from the low

power dissipation oscillator). In the edge-sensitive

mode, even if the HOLD pin input is high, the hold

operation is performed.

Example: To start the hold operation in the edge-sen-

sitive release mode (the warm-up time =

214/fc).

A, #0101B ;

OP10

←0101

OUT A, %OP10

Figure 2-20. Edge-Sensitive Release Mode

Note 1:

In the hold operation, the dissipation of the power associated with

the oscillator and the internal hardware is lowered; however, the

power dissipation associated with the pin interface (depending on

the external circuitry and program) is not directly determined by the

hardware operation of the hold feature. This point should be con-

sidered in the system design and the interface circuit design.

Note 2:

In the CMOS circuitry, a current does not ﬂow when the input level

is stable at the power voltage level (VDD/VSS): however, when the

input level gets higher than the power voltage level (by approxi-

mately 0.3 to 0.5 V), a current begins to ﬂow. Therefore, if cutting

off the output transistor at an I/O port (the open drain output pin

with an input transistor connected) puts the pin signal into the

high-impedance state, a current ﬂows across the ports input tran-

sistor, requiring to ﬁx the level by pull-up or other means.

(2)

Releases Hold Operating Mode

The hold operating mode is released in the following

sequence:

The oscillator starts

Warm-up is performed to acquire the time for stabi-

lizing oscillation. During the warm-up, the internal

operations are all stopped. One of three warm-up

times can be selected by program depending on

the characteristics of the oscillator used.

When the warm-up time has passed, an ordinary

operation restarts from the instruction next to the

instruction which starts the hold operation. At this

time, the interval timer starts from the reset state

“0”.

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