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ST7LITE49M 数据表(PDF) 69 Page - STMicroelectronics |
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ST7LITE49M 数据表(HTML) 69 Page - STMicroelectronics |
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69 / 188 page  ST7LITE49M Power saving modes 69/188 9.5.3 AWUFH Prescaler register (AWUPR) Reset value: 1111 1111 (FFh) Bits 7:0= AWUPR[7:0] Auto Wake Up Prescaler These 8 bits define the AWUPR Dividing factor (see Table 20). In AWU mode, the time during which the MCU stays in Halt mode, tAWU, is given by the equation below. See also Figure 32 on page 66. The AWUPR prescaler register can be programmed to modify the time during which the MCU stays in Halt mode before waking up automatically. Note: If 00h is written to AWUPR, the AWUPR remains unchanged. 7 0 AWUPR7 AWUPR6 AWUPR5 AWUPR4 AWUPR3 AWUPR2 AWUPR1 AWUPR0 Read/Write Table 20. Configuring the dividing factor AWUPR[7:0] Dividing factor 00h Forbidden 01h 1 ... ... FEh 254 FFh 255 t AWU 64 AWUPR × 1 f AWURC -------------------- × t RCSTRT + = Table 21. AWU register mapping and reset values Address (Hex.) Register label 7 6543 210 0048h AWUCSR Reset Value 0 0000 AWUF AWUM AWUEN 0049h AWUPR Reset Value AWUPR7 1 AWUPR6 1 AWUPR5 1 AWUPR4 1 AWUPR3 1 AWUPR2 1 AWUPR1 1 AWUPR0 1 |
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