Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
ST62E25BB1 Datasheet(PDF) 50 Page - STMicroelectronics |
|
ST62E25BB1 Datasheet(HTML) 50 Page - STMicroelectronics |
50 / 105 page ST6215C ST6225C 50/105 8-BIT TIMER (Cont’d) 9.2.4.2 Event Counter Mode (TOUT = “0”, DOUT = “0”) In this mode, the TIMER pin is the input clock of the Timer prescaler which is decremented on eve- ry rising edge of the input clock (allowing event count). See Figure 30 and Figure 31. This mode is selected by clearing the TOUT bit in the TSCR register (i.e. as input) and clearing the DOUT bit. Note: In this mode, if the TIMER pin is multi- plexed, the corresponding port control bits have to be set in input with pull-up configuration. Figure 30. fTIMER Clock in Event Counter Mode Figure 31. Event Counter Mode Operation 9.2.4.3 Output Mode (TOUT = “1”, DOUT = “data out”) In Output mode, the TIMER pin is connected to the DOUT latch, hence the Timer prescaler is clocked by the prescaler clock input (fINT/12). See Figure 32. The user can select the prescaler division ratio us- ing the PS[2:0] bits in the TSCR register. When TCR decrements to zero, it sets the TMZ bit in the TSCR. The TMZ bit can be tested under program control to perform a timer function whenever it goes high and has to be cleared by the user. The low-to-high TMZ bit transition is used to latch the DOUT bit in the TSCR and, if the TOUT bit is set, DOUT is trans- ferred to the TIMER pin. This operating mode allows external signal generation on the TIMER pin. See Figure 33. This mode is selected by setting the TOUT bit in the TSCR register (i.e. as output) and setting the DOUT bit to output a high level or clearing the DOUT bit to output a low level. Note: As soon as the TOUT bit is set, The timer pin is configured as output push-pull regardless of the corresponding I/O port control registers setting (if the TIMER pin is multiplexed). Figure 32. Output Mode Control Figure 33. Output Mode Operation fPRESCALER TIMER XX1 COUNTER VALUE TIMER PIN VALUE 1 VALUE 2 XX2 TMZ TIMER TOUT DOUT LATCH FFh 1 Counter TIMER PIN 1st downcount: Default output value is 0 At each zero event DOUT has to be copied to the TIMER pin 1 |
Número de pieza similar - ST62E25BB1 |
|
Descripción similar - ST62E25BB1 |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes 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 |