tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 218
tmp89fm42
Manufacturer Part Number
tmp89fm42
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42.pdf
(408 pages)
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15.3 Function
15. Real Time Clock (RTC)
RA000
15.3 Function
15.3.1 Low Power Consumption Function
15.3.2 Enabling/disabling the real time clock operation
15.3.3 Selecting the interrupt generation interval
Note 1: fs: Low-frequency clock [Hz]
Note 2: RTCCR<RTCSEL> can be rewritten only when RTCCR<RTCRUN> is "0". If data is written into RTCCR<RTC-
Note 3: If the real time clock is enabled and when 1) SYSCR2<XTEN> is cleared to "0" to stop the low-frequency clock
clock is not being used.
that this renders the real time clock unusable. Setting POFFCR2<RTCEN> to "1" enables the basic clock sup-
ply to real time clock and allows the real time clock to operate.
using the real time clock for the first time, be sure to set POFFCR2<RTCEN> to "1" in the initial setting of the
program (before the real time clock control registers are operated).
may operate unexpectedly.
disables the real time clock operation.
RTCCR<RTCSEL> when RTCCR<RTCRUN> is "1", the existing data remains effective.
be rewritten at the same time as disabling the real time clock operation.
Real time clock has the low power consumption registers (POFFCR2) that save power when the real time
Setting POFFCR2<RTCEN> to "0" disables the basic clock supply to real time clock to save power. Note
After reset, POFFCR2<RTCEN> are initialized to "0", and this renders the real time clock unusable. When
Do not change POFFCR2<RTCEN> to "0" during the real time clock operation. Otherwise real time clock
Setting RTCCR<RTCRUN> to "1" enables the real time clock operation. Setting RTCCR<RTCRUN> to "0"
RTCCR<RTCRUN> is cleared to "0" just after reset release.
The interrupt generation interval can be selected at RTCCR<RTCSEL>.
RTCCR<RTCSEL> can be rewritten only when RTCCR<RTCRUN> is "0". If data is written into
RTCCR<RTCSEL> can be rewritten at the same time as enabling the real time clock operation, but it cannot
SEL> when RTCCR<RTCRUN> is "1", the existing data remains effective. RTCCR<RTCSEL> can be rewritten at
the same time as enabling the real time clock, but it cannot be rewritten at the same time as disabling the real time
clock.
oscillation circuit or 2) the operation is changed to the STOP mode or the SLEEP0 mode, the data in
RTCCR<RTCSEL> is maintained and RTCCR<RTCRUN> is cleared to "0".
RTCRUN
RTCSEL
Selects the interrupt generation interval
Enables/disables the real time clock opera-
tion
Page 204
000 : 2
001 : 2
010 : 2
011 : 2
100 : 2
101 : 2
110 : 2
111 : 2
0 : Disable
1 : Enable
12
9
8
15
14
13
11
10
/fs (7.81 [ms] @fs=32.768kHz)
/fs (15.62 [ms] @fs=32.768kHz)
/fs (1.000 [s] @fs=32.768kHz)
/fs (0.500 [s] @fs=32.768kHz)
/fs (0.250 [s] @fs=32.768kHz)
/fs (125.0 [ms] @fs=32.768kHz)
/fs (62.50 [ms] @fs=32.768kHz)
/fs (31.25 [ms] @fs=32.768kHz)
TMP89FM42
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