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ST7DALI Datasheet(PDF) 45 Page - STMicroelectronics |
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ST7DALI Datasheet(HTML) 45 Page - STMicroelectronics |
45 / 141 page ST7DALI 45/141 POWER SAVING MODES (Cont’d) 9.6.0.1 Register Description AWUFH CONTROL/STATUS REGISTER (AWUCSR) Read/Write Reset Value: 0000 0000 (00h) Bits 7:3 = Reserved. Bit 1= AWUF Auto Wake Up Flag This bit is set by hardware when the AWU module generates an interrupt and cleared by software on reading AWUCSR. Writing to this bit does not change its value. 0: No AWU interrupt occurred 1: AWU interrupt occurred Bit 1= AWUM Auto Wake Up Measurement This bit enables the AWU RC oscillator and con- nects its output to the inputcapture of the 12-bit Auto-Reload timer. This allows the timer to be used to measure the AWU RC oscillator disper- sion and then compensate this dispersion by pro- viding the right value in the AWUPRE register. 0: Measurement disabled 1: Measurement enabled Bit 0 = AWUEN Auto Wake Up From Halt Enabled This bit enables the Auto Wake Up From Halt fea- ture: once HALT mode is entered, the AWUFH wakes up the microcontroller after a time delay de- pendent on the AWU prescaler value. It is set and cleared by software. 0: AWUFH (Auto Wake Up From Halt) mode disa- bled 1: AWUFH (Auto Wake Up From Halt) mode ena- bled AWUFH PRESCALER REGISTER (AWUPR) Read/Write Bits 7:0= AWUPR[7:0] Auto Wake Up Prescaler These 8 bits define the AWUPR Dividing factor (as explained below: In AWU mode, the period that the MCU stays in Halt Mode (tAWU in Figure 28 on page 43) is de- fined by This prescaler register can be programmed to modify the time that the MCU stays in Halt mode before waking up automatically. Note: If 00h is written to AWUPR, depending on the product, an interrupt is generated immediately after a HALT instruction, or the AWUPR remains inchanged. Table 7. AWU Register Map and Reset Values 70 00 000 AWU F AWU M AWU EN 70 AWU PR7 AWU PR6 AWU PR5 AWU PR4 AWU PR3 AWU PR2 AWU PR1 AWU PR0 AWUPR[7:0 ] Dividing factor 00h Forbidden 01h 1 ... ... FEh 254 FFh 255 t AWU 64 AWUPR × 1 f AWURC --------------------------t RCSTRT + × = Address (Hex.) Register Label 76543 210 0049h AWUPR Reset Value AWUPR7 1 AWUPR6 1 AWUPR5 1 AWUPR4 1 AWUPR3 1 AWUPR2 1 AWUPR1 1 AWUPR0 1 004Ah AWUCSR Reset Value 00000 AWUF AWUM AWUEN 1 |
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