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ST10F269Z2Q3 数据表(PDF) 101 Page - STMicroelectronics

部件名 ST10F269Z2Q3
功能描述  16-BIT MCU WITH MAC UNIT, 256K BYTE FLASH MEMORY AND 12K BYTE RAM
PDF  161 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST10F269Z2Q3 数据表(HTML) 101 Page - STMicroelectronics

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16.1.2 - RTCPH & RTCPL: RTC PRESCALER Registers
The 20-bit programmable prescaler divider is loaded with 2 registers.
The 4 most significant bit are stored into RTCPH and the 16 Less significant bit are stored in RTCPL. In
order to keep the system clock, those registers are not reset.
They are write protected by bit RTOFF of RTCCON register, write operation is allowed if RTOFF is set.
RTCPL (EC06h)
XBUS
Reset Value: XXXXh
RTCPH (EC08h)
XBUS
Reset Value: ---Xh
The value stored into RTCPH, RTCPL is called RTCP (coded on 20-bit). The dividing ratio of the
Prescaler divider is: ratio = 64 x (RTCP)
16.1.3 - RTCDH & RTCDL: RTC DIVIDER Counters
Every basic reference clock the DIVIDER counters are reloaded with the value stored RTCPH and
RTCPL registers. To get an accurate time measurement it is possible to read the value of the DIVIDER,
reading the RTCDH, RTCDL. Those counters are read only. After any bit changed in the programmable
PRESCALER register, the new value is loaded in the DIVIDER.
RTCDL (EC0Ah)
XBUS
Reset Value: XXXXh
RTCDH (EC0Ch)
XBUS
Reset Value: ---Xh
Note: Those registers are not reset, and are read only.
15
14
13
12
11
10
987654
3210
RTCPL
RW
15
14
13
12
11
10
987654
3210
RESERVED
RTCPH
RW
Figure 52 : PRESCALER Register
15
14
13
12
11
10
987654
3210
RTCDL
R
15
14
13
12
11
10
987654
3210
RESERVED
RTCDH
R
3
2
1
0
7
6
5
4
11 10 9
8
15 14 13 12
3
2
1
0
RTCPH
RTCPL
3
2
1
0
7
6
5
4
11 10 9
8
15 14 13 12
19 18 17 16
20 bit word counter



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