参数资料
型号: ST10F269Z2Q3
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP144
封装: 28 X 28 MM, PLASTIC, QFP-144
文件页数: 5/160页
文件大小: 1541K
代理商: ST10F269Z2Q3
ST10F269
102/160
When RTCD increments to reach 00000h, The 20-bit word stored into RTCPH, RTCPL registers is loaded
in RTCD.
Bit 15 to bit 4 of RTCPH and RTCDH are not used. When reading, the return value of those bit will be
zeros.
16.1.4 - RTCH & RTCL: RTC Programmable COUNTER Registers
The RTC has 2 x 16-bit programmable counters which count rate is based on the basic time reference (for
example 1 second). As the clock oscillator may be kept working, even in power down mode, the RTC
counters may be used as a system clock. In addition RTC counters and registers are not modified at any
system reset. The only way to force their value is to write them via the XBUS.
Those counters are write protected as well. The bit RTOFF of the RTCCON register must be set (RTC
dividers and counters are stopped) to enable a write operation on RTCH or RTCL.
A write operation on RTCH or RTCL register loads directly the corresponding counter. When reading, the
current value in the counter (system date) is returned.
The counters keeps on running while the clock oscillator is working.
RTCL (EC0Eh)
XBUS
Reset Value: XXXXh
RTCH (EC10h)
XBUS
Reset Value: XXXXh
Note: Those registers are nor reset
Figure 53 : DIVIDER Counters
15
14
13
12
11
10
9876543210
RTCL
RW
15
14
13
12
11
10
9876543210
RTCH
RW
3
2
1
0
7
6
5
4
11 10 9
8
15 14 13 12
3
2
1
0
RTCDH
RTCDL
3
2
1
0
7
6
5
4
11 10 9
8
15 14 13 12
19 18 17 16
20 bit word internal value of the prescalar divider
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