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NRF52811-QCAA-R Datasheet(PDF) 19 Page - Nordic Semiconductor |
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NRF52811-QCAA-R Datasheet(HTML) 19 Page - Nordic Semiconductor |
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19 / 444 page  Core components ID Base address Peripheral Instance Description 15 0x4000F000 CCM CCM AES CCM mode encryption 16 0x40010000 WDT WDT Watchdog timer 17 0x40011000 RTC RTC1 Real-time counter 1 18 0x40012000 QDEC QDEC Quadrature decoder 19 0x40013000 COMP COMP General purpose comparator 20 0x40014000 EGU EGU0 Event generator unit 0 20 0x40014000 SWI SWI0 Software interrupt 0 21 0x40015000 EGU EGU1 Event generator unit 1 21 0x40015000 SWI SWI1 Software interrupt 1 22 0x40016000 SWI SWI2 Software interrupt 2 23 0x40017000 SWI SWI3 Software interrupt 3 24 0x40018000 SWI SWI4 Software interrupt 4 25 0x40019000 SWI SWI5 Software interrupt 5 28 0x4001C000 PWM PWM0 Pulse-width modulation unit 0 29 0x4001D000 PDM PDM Pulse-density modulation (digital microphone interface) 30 0x4001E000 NVMC NVMC Non-volatile memory controller 31 0x4001F000 PPI PPI Programmable peripheral interconnect N/A 0x10000000 FICR FICR Factory information configuration N/A 0x10001000 UICR UICR User information configuration Table 4: Instantiation table 4.3 NVMC — Non-volatile memory controller The non-volatile memory controller (NVMC) is used for writing and erasing of the internal flash memory and the UICR (user information configuration registers). The CONFIG on page 21 is used to enable the NVMC for writing (CONFIG.WEN) and erasing (CONFIG.EEN). The user must make sure that writing and erasing are not enabled at the same time. Having both enabled at the same time may result in unpredictable behavior. The CPU must be halted before initiating a NVMC operation from the debug system. 4.3.1 Writing to flash When writing is enabled, full 32-bit words are written to word-aligned addresses in flash. As illustrated in Memory on page 16, the flash is divided into multiple pages. The same 32-bit word in the flash can only be written nWRITE number of times before a page erase must be performed. The NVMC is only able to write 0 to bits in the flash that are erased (set to 1). It cannot rewrite a bit back to 1. Only full 32-bit words can be written to flash using the NVMC interface. To write less than 32 bits, write the data as a full 32-bit word and set all the bits that should remain unchanged in the word to 1. Note that the restriction on the number of writes (nWRITE) still applies in this case. Only word-aligned writes are allowed. Byte or half-word-aligned writes will result in a hard fault. The time it takes to write a word to flash is specified by tWRITE. The CPU is halted while the NVMC is writing to the flash. 4.3.2 Erasing a page in flash When erase is enabled, the flash memory can be erased page by page using the ERASEPAGE on page 21. 4454_140 v1.0 19 |
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