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SST89E58RD2-33-I-NJE1 Datasheet(PDF) 47 Page - Silicon Storage Technology, Inc |
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SST89E58RD2-33-I-NJE1 Datasheet(HTML) 47 Page - Silicon Storage Technology, Inc |
47 / 81 page Data Sheet FlashFlex51 MCU SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD 47 ©2006 Silicon Storage Technology, Inc. S71255-05-000 5/06 The table below summarizes various clock inputs at two common frequencies. The four possible CMOD timer modes with and without the overflow interrupt enabled are shown below. This list assumes that PCA will be left running during idle mode. The CCON register is associated with all PCA timer functions. It contains run control bits and flags for the PCA timer (CF) and all modules. To run the PCA the CR bit (CCON.6) must be set by software. Clearing the bit, will turn off PCA. When the PCA counter overflows, the CF (CCON.7) will be set, and an interrupt will be generated if the ECF bit in the CMOD register is set. The CF bit can only be cleared by software. Each module has its own timer interrupt or capture interrupt flag (CCF0 for module 0, CCF4 for module 4, etc.). They are set when either a match or capture occurs. These flags can only be cleared by software. (See “PCA Timer/Counter Control Register (CCON)” on page 26.) TABLE 8-2: PCA Timer/Counter Inputs PCA Timer/Counter Mode Clock Increments 12 MHz 16 MHz Mode 0: fOSC/12 1 µsec 0.75 µsec Mode 1: 330 nsec 250 nsec Mode 2: Timer 0 Overflows1 1. In Mode 2, the overflow interrupt for Timer 0 does not need to be enabled. Timer 0 programmed in: 8-bit mode 256 µsec 192 µsec 16-bit mode 65 msec 49 µsec 8-bit auto-reload 1 to 255 µsec 0.75 to 191 µsec Mode 3: External Input MAX 0.66 µsec 0.50 µsec T8-2.0 1255 TABLE 8-3: CMOD Values PCA Count Pulse Selected CMOD Value Without Interrupt Enabled With Interrupt Enabled Internal clock, fOSC/12 00H 01H Internal clock, fOSC/4 02H 03H Timer 0 overflow 04H 05H External clock at P1.2 06H 07H T8-3.0 1255 |
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