W79E217A Datasheet, PDF (95/207 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E217A Data Sheet
12.1.3 Mode 1
Mode 1 is the same as Mode 0, except that the timer/counter is 16 bits, instead of 13 bits.
Figure 12-1: Timer/Counters 0 & 1 in Mode 0 and Mode 1
12.1.4 Mode 2
In Mode 2, the timer/counter is in the Auto Reload Mode. In this mode, TLx acts as an 8 bits count
register, while 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.
The reload operation leaves the contents of the THx register unchanged. Counting is enabled by the
TRx bit and proper setting of GATE and INTx pins. As in the other two modes 0 and 1, mode 2 allows
counting of either clock cycles (clock/12 or clock/4) or pulses on pin Tn.
Figure 12-2: Timer/Counter 0 & 1 in Mode 2
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Publication Release Date: December 14, 2007
Revision A3.0