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N79E855 Datasheet(PDF) 39 Page - List of Unclassifed Manufacturers |
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N79E855 Datasheet(HTML) 39 Page - List of Unclassifed Manufacturers |
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39 / 180 page  N79E855/854 Data Sheet April 23, 2014 Page 39 of 180 Revision A2.5 FSYS 1/12 0 1 0 4 7 0 7 TFx TH0 (TH1) TL0 (TL1) Interrupt T0/T1 (C/T=TMOD.6) C/T=TMOD.2 GATE INT0/INT1 TF0 (TF1) TR0/TR1 1/4 0 1 T0M=CKCON.3 (T1M=CKCON.4) 0 1 1 T0OE P1.2 (P0.7) PIN P1.2 (P0.7) SFR (T1OE) T0OE (T1OE) En Figure 10–2 Timers/Counters 0 and 1 in Mode 1 10.1.3 Mode 2 (8-bit Auto-Reload Timer) In Mode 2, the Timer/Counter is in auto-reload mode. In this mode, TLx acts as an 8-bit count register whereas THx holds the reload value. When the TLx register overflows from FFH to 00H, the TFx bit in TCON is set and TLx is reloaded with the contents of THx and the counting process continues from here. The reload operation leaves the contents of the THx register unchanged. This feature is best suitable for UART baud rate generator for it runs without continuous software intervention. Note that only Timer1 can be the baud rate source for UART. Counting is enabled by the TRx bit and proper setting of GATE and INTx pins. The functions of GATE and INTx pins are just the same as Mode 0 and 1. 0 1 0 7 0 7 TFx TH0 (TH1) TL0 (TL1) Interrupt T0OE T0/T1 (C/T=TMOD.6) C/T=TMOD.2 GATE INT0/INT1 P1.2 (P0.7) TF0 (TF1) TR0/TR1 (T1OE) FSYS 1/12 0 1/4 0 1 T0M=CKCON.3 (T1M=CKCON.4) Figure 10–3 Timer/Counter 0 and 1 in Mode 2 10.1.4 Mode 3 (Two Separate 8-bit Timers) Mode 3 has different operating methods for the two timers/counters. For timer/counter 1, mode 3 simply freezes the counter. Timer/Counter 0, however, configures TL0 and TH0 as two separate 8 bit count registers in this mode. The logic for this mode is shown in the following figure. TL0 uses the Timer/Counter 0 control bits T C/ , GATE, TR0, INT0 and TF0. The TL0 can be used to count clock cycles (clock/12 or clock/4) or 1-to-0 transitions on pin T0 as determined by C/T |
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