Electronic Components Datasheet Search |
|
C8051F591-IMR Datasheet(PDF) 4 Page - Silicon Laboratories |
|
C8051F591-IMR Datasheet(HTML) 4 Page - Silicon Laboratories |
4 / 6 page Bulletin #1512071 _____________________________________________________________________________________________________ W7206F2 Silicon Labs Bulletin rev N The information contained in this document is PROPRIETARY to Silicon Laboratories, Inc. and shall not be reproduced or used in part or whole without Silicon Laboratories’ written consent. The document is uncontrolled if printed or electronically saved. Pg 6 Change VDD monitor to high threshold and use external supply monitor for systems that require programming flash in-system - Added a section regarding steps to reprogram the VDD monitor high threshold in section 15.1.1 Reprogramming the VDD Monitor High Threshold on page 138. - Recommendation is to add external supply monitor for systems that require programming flash in- system on section 15.1.1 Reprogramming the VDD Monitor High Threshold on page 138. The output of the internal voltage regulator is calibrated by the MCU immediately after any reset event. The output of the un-calibrated internal regulator could be below the high threshold setting of the VDD Monitor. If this is the case and the VDD Monitor is set to the high threshold setting and if the MCU receives a non- power on reset (POR), the MCU will remain in reset until a POR occurs (i.e., VDD Monitor will keep the device in reset). A POR will force the VDD Monitor to the low threshold setting which is guaranteed to be below the un-calibrated output of the internal regulator. The device will then exit reset and resume normal operation. It is for this reason Silicon Labs strongly recommends that the VDD Monitor is always left in the low threshold setting (i.e. default value upon POR). When programming the Flash in-system, the VDD Monitor must be set to the high threshold setting. To prevent this issue from happening and ensure the highest system reliability, firmware can change the VDD Monitor high threshold and use an external supply monitor that meets the Flash VDD requirement listed in Table 5.5 on page 48. To change the VDD Monitor high threshold, perform the following steps: 1. Disable interrupts. 2. Write 0x01 to the SFRPAGE register. 3. Copy the value from SFR address 0x93 to SFR address 0x94. 4. Return the SFRPAGE register to its previous value. VDD monitor may trigger on fast VDD changes – Added a note regarding fast changes on VDD causing the VDD Monitor to trigger to section 17.2 Power- Fail Reset/VDD Monitor on page 154. Note: The VDD Monitor may trigger on fast changes in voltage on the VDD pin, regardless of whether the voltage increased or decreased. UART TX THRE0 bit may return incorrect status – Added notes regarding UART TX and RX behavior in section 24.3.1 Data Transmission on page 259, section 24.3.2 Data Reception on page 259. Note: THRE0 can have a momentary glitch high when the UART Transmit Holding Register is not empty. The glitch will occur sometime after SBUF0 was written with the previous byte and does not occur if THRE0 is checked in the instruction(s) immediately following the write to SBUF0. When firmware writes SBUF0 and SBUF0 is not empty, TX0 will be stuck low until the next device reset. Firmware should use or poll on TI0 rather than THRE0 for asynchronous UART writes that may have a random delay in between transactions. |
Similar Part No. - C8051F591-IMR |
|
Similar Description - C8051F591-IMR |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |