TMP86FS23UG datasheet(187/252 Pages) TOSHIBA

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Page 175

TMP86FS23UG

16. Real-Time Clock

The TMP86FS23UG include a real time counter (RTC). A low-frequency clock can be used to provide a periodic

interrupt (0.0625[s],0.125[s],0.25[s],0.50[s]) at a programmed interval, implement the clock function. The RTC can

be used in the mode in which the low-frequency oscillator is active (except for the SLEEP0 mode).

16.1 Configuration

Figure 16-1 Configuration of the RTC

16.2 Control of the RTC

The RTC is controlled by the RTC control register (RTCCR).

Note 1: Program the RTCCR during low-frequency oscillation (when SYSCR2<XTEN> = “1”). For selecting an interrupt genera-

tion period, program the RTCSEL when the timer is inactive (RTCRUN = “0”). During the timer operation, do not change

the RTCSEL programming at the same moment the timer stops.

Note 2: The timer automatically stops, and this register is initialized (the timer's binary counter is also initialized) if one of the fol-

lowing operations is performed while the timer is active:

1. Stopping the low-frequency oscillation (with SYSCR2<XTEN> = “0”)

2. When the TMP86FS23UG are put in STOP or SLEEP0 mode

Therefore, before activating the timer after releasing from STOP or SLEEP0 mode, reprogram the registers again.

Note 3: If a read instruction for RTCCR is executed, undefined value is set to bits 7 to 3.

Note 4: If break processing is performed on the debugger for the development tool during the timer operation, the timer stops

counting (contents of the RTCCR isn't altered). When the break is cancelled, processing is restarted from the point at

which it was suspended.

RTC Control Register

RTCCR

(0017H)

RTCSEL

RTCRUN

(Initial value: **** *000)

RTCSEL

Interrupt generation period

(fs = 32.768 kHz)

00: 0.50 [s]

01: 0.25 [s]

10: 0.125 [s]

11: 0.0625 [s]

R/W

RTCRUN

RTC control

0: Stops and clears the binary counter.

1: Starts counting

Selector

RTCCR

RTCSEL

Interrupt request

INTRTC

Binary counter

RTCRUN

214/fs

213/fs

212/fs

211/fs

(32.768 kHz)

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