Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
SST89E554RC-40-I-TQJ Datasheet(PDF) 48 Page - Silicon Storage Technology, Inc |
|
SST89E554RC-40-I-TQJ Datasheet(HTML) 48 Page - Silicon Storage Technology, Inc |
48 / 86 page 48 Data Sheet FlashFlex51 MCU SST89E564RD / SST89V564RD / SST89E554RC / SST89V554RC ©2003 Silicon Storage Technology, Inc. S71207-04-000 12/03 8.0 PROGRAMMABLE COUNTER ARRAY The Programmable Counter Array (PCA) present on the SST89E/V554RC and SST89E/V564RD is a special 16-bit timer that has five 16-bit capture/compare modules. Each of the modules can be programmed to operate in one of four modes: rising and/or falling edge capture, software timer, high-speed output, or pulse width modulator. The 5th module can be programmed as a Watchdog Timer in addi- tion to the other four modes. Each module has a pin asso- ciated with it in port 1. Module 0 is connected to P1.3 (CEX0), module 1 to P1[4] (CEX1), module 2 to P1[5] (CEX2), module 3 to P1[6] (CEX3), and module 4 to P1[7] (CEX4). PCA configuration is shown in Figure 8-1. 8.1 PCA Overview PCA provides more timing capabilities with less CPU inter- vention than the standard timer/counter. Its advantages include reduced software overhead and improved accuracy. The PCA consists of a dedicated timer/counter which serves as the time base for an array of five compare/cap- ture modules. Figure 8-1 shows a block diagram of the PCA. External events associated with modules are shared with corresponding Port 1 pins. Modules not using the port pins can still be used for standard I/O. Each of the five modules can be programmed in any of the following modes: • Rising and/or falling edge capture • Software timer • High speed output • Watchdog Timer (Module 4 only) • Pulse Width Modulator (PWM) 8.2 PCA Timer/Counter The PCA timer is a free-running 16-bit timer consisting of registers CH and CL (the high and low bytes of the count values). The PCA timer is common time base for all five modules and can be programmed to run at: 1/6 the oscilla- tor frequency, 1/2 the oscillator frequency, Timer 0 overflow, or the input on the ECI pin (P1.2). The timer/counter source is determined from the CPS1 and CPS0 bits in the CMOD SFR as follows (see “PCA Timer/Counter Mode Register (CMOD)” on page 26): FIGURE 8-1: PCA TIMER/COUNTER AND COMPARE/CAPTURE MODULES TABLE 8-1: PCA TIMER/COUNTER SOURCE CPS1 CPS0 12 Clock Mode 6 Clock Mode 00 fOSC /12 fOSC /6 01 fOSC /4 fOSC /2 1 0 Timer 0 overflow Timer 0 overflow 1 1 External clock at ECI pin (maximum rate = fOSC /8) External clock at ECI pin (maximum rate = fOSC /4) T8-1.0 1207 Module 0 Module 1 Module 2 Module 3 Module 4 PCA Timer/Counter 1207 F34.0 P1.7/CEX4 P1.6/CEX3 P1.5/CEX2 P1.4/CEX1 P1.3/CEX0 16 Bits 16 Bits Each |
Número de pieza similar - SST89E554RC-40-I-TQJ |
|
Descripción similar - SST89E554RC-40-I-TQJ |
|
|
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 |