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AT87C5103-ICSAL Datasheet(PDF) 37 Page - ATMEL Corporation |
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AT87C5103-ICSAL Datasheet(HTML) 37 Page - ATMEL Corporation |
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37 / 64 page  37 4134B–8051–06/03 PCA Timer Figure 21. PCA Timer/Counter Table 22. CMOD: PCA Counter Mode Register CMOD Address 0D9H CIDL WDTE - - - CPS1 CPS0 ECF Reset value 0 0 X X X 0 0 0 Symbol Function CIDL Counter Idle control: CIDL = 0 programs the PCA Counter to continue functioning during idle Mode. CIDL = 1 programs it to be gated off during idle. WDTE Watchdog Timer Enable: WDTE = 0 disables Watchdog Timer function on PCA Module 4. WDTE = 1 enables it. - Not implemented, reserved for future use. (1) 1. User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new fea- tures. In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate. CPS1 PCA Count Pulse Select bit 1. CPS0 PCA Count Pulse Select bit 0. CPS1 CPS0 Selected PCA input. (2) 2. f osc = oscillator frequency 0 0 Internal clock f osc/12 (Or fosc/6 in X2 Mode). 0 1 Internal clock f osc/4 (Or fosc/2 in X2 Mode). 1 0 Timer 0 Overflow 1 1 External clock at ECI/P1.2 pin (max rate = f osc/ 8) ECF PCA Enable Counter Overflow interrupt: ECF = 1 enables CF bit in CCON to generate an interrupt. ECF = 0 disables that function of CF. CIDL CPS1 CPS0 ECF It CH CL 16-bit Up/Down Counter To PCA Modules Fosc/12 Fosc/4 T0 OVF P1.2 Idle CMOD 0xD9 WDTE CF CR CCON 0xD8 CCF4 CCF3 CCF2 CCF1 CCF0 Overflow |
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