Electronic Components Datasheet Search |
|
ST72361 Datasheet(PDF) 23 Page - STMicroelectronics |
|
ST72361 Datasheet(HTML) 23 Page - STMicroelectronics |
23 / 224 page ST72361 23/224 6.3 RESET SEQUENCE MANAGER (RSM) 6.3.1 Introduction The reset sequence manager includes three RE- SET sources as shown in Figure 2: ■ External RESET source pulse ■ Internal LVD RESET (Low Voltage Detection) ■ Internal WATCHDOG RESET These sources act on the RESET pin and it is al- ways kept low during the delay phase. The RESET service routine vector is fixed at ad- dresses FFFEh-FFFFh in the ST7 memory map. The basic RESET sequence consists of three phases as shown in Figure 1: ■ Active Phase depending on the RESET source ■ 256 or 4096 CPU clock cycle delay (selected by option byte) ■ RESET vector fetch The 256 or 4096 CPU clock cycle delay allows the oscillator to stabilize and ensures that recovery has taken place from the Reset state. The shorter or longer clock cycle delay should be selected by option byte to correspond to the stabilization time of the external oscillator used in the application. The RESET vector fetch phase duration is two clock cycles. Figure 12. RESET Sequence Phases 6.3.2 Asynchronous External RESET pin The RESET pin is both an input and an open-drain output with integrated RON weak pull-up resistor. This pull-up has no fixed value but varies in ac- cordance with the input voltage. It can be pulled low by external circuitry to reset the device. See Electrical Characteristic section for more details. A RESET signal originating from an external source must have a duration of at least th(RSTL)in in order to be recognized (see Figure 3). This detec- tion is asynchronous and therefore the MCU can enter reset state even in HALT mode. Figure 13. Reset Block Diagram RESET Active Phase INTERNAL RESET 256 or 4096 CLOCK CYCLES FETCH VECTOR RESET RON VDD WATCHDOG RESET LVD RESET INTERNAL RESET PULSE GENERATOR Filter |
Similar Part No. - ST72361 |
|
Similar Description - ST72361 |
|
|
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 |