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15. Real Time Clock (RTC)
15.3 Function
TMP89FM42
RA000
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-
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.
Note 3: If the real time clock is enabled and when 1) SYSCR2<XTEN> is cleared to "0" to stop the low-frequency 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".
15.3 Function
15.3.1 Low Power Consumption Function
Real time clock has the low power consumption registers (POFFCR2) that save power when the real time
clock is not being used.
Setting POFFCR2<RTCEN> to "0" disables the basic clock supply to real time clock to save power. Note
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.
After reset, POFFCR2<RTCEN> are initialized to "0", and this renders the real time clock unusable. When
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).
Do not change POFFCR2<RTCEN> to "0" during the real time clock operation. Otherwise real time clock
may operate unexpectedly.
15.3.2 Enabling/disabling the real time clock operation
Setting RTCCR<RTCRUN> to "1" enables the real time clock operation. Setting RTCCR<RTCRUN> to "0"
disables the real time clock operation.
RTCCR<RTCRUN> is cleared to "0" just after reset release.
15.3.3 Selecting the interrupt generation interval
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> 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 operation, but it cannot
be rewritten at the same time as disabling the real time clock operation.
RTCSEL
Selects the interrupt generation interval
000 : 2
15
/fs (1.000 [s] @fs=32.768kHz)
001 : 2
14
/fs (0.500 [s] @fs=32.768kHz)
010 : 2
13
/fs (0.250 [s] @fs=32.768kHz)
011 : 2
12
/fs (125.0 [ms] @fs=32.768kHz)
100 : 2
11
/fs (62.50 [ms] @fs=32.768kHz)
101 : 2
10
/fs (31.25 [ms] @fs=32.768kHz)
110 : 2
9
/fs (15.62 [ms] @fs=32.768kHz)
111 : 2
8
/fs (7.81 [ms] @fs=32.768kHz)
RTCRUN
Enables/disables the real time clock opera-
tion
0 : Disable
1 : Enable
Содержание TLCS-870/C1 Series
Страница 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Страница 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Страница 4: ......
Страница 14: ......
Страница 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Страница 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Страница 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Страница 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Страница 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Страница 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Страница 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Страница 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Страница 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Страница 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Страница 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Страница 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Страница 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Страница 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Страница 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Страница 336: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 Note 1 Make sure that you set the C register to 0x00 LD FLSCR2 0xD5 ...
Страница 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Страница 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Страница 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Страница 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Страница 406: ...26 Package Dimensions TMP89FM42 ...
Страница 408: ......