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数据搜索系统，热门电子元器件搜索 |
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ST7LITE49K2 数据表(PDF) 73 Page - STMicroelectronics |
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ST7LITE49K2 数据表(HTML) 73 Page - STMicroelectronics |
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73 / 245 page  ST7LITE49K2 Power saving modes 73/245 9.5.3 AWUFH prescaler register (AWUPR) Reset value: 1111 1111 (FFh) Bits 7:0= AWUPR[7:0] Auto-wakeup prescaler These 8 bits define the AWUPR Dividing factor (see Table 21). 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 70. 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 21. 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 22. AWU register mapping and reset values Address (Hex.) Register label 765 4321 0 0048h AWUCSR Reset Value 000 00 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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