W79E648 Datasheet, PDF (43/80 Pages) Winbond – Fast 8051 Compatible microcontroller with a redesigned Processor

Preliminary W79E648
osc
T2 = P1.0
TR2 = T2CON.2
T2M = CKCON.5
1/4
1
C/T2 = T2CON.1
0
1/12 0
1
T2EX = P1.1
EXEN2 = T2CON.3
TL2 TH2
T2CON.7
TF2
RCAP2L RCAP2H
EXF2
T2CON.6
Timer 2
Interrupt
Figure 14. 16-Bit Capture Mode
Auto-reload Mode, Counting up
The auto-reload mode as an up counter is enabled by clearing the CP / RL2 bit in the T2CON register
and clearing the DCEN bit in T2MOD register. In this mode, Timer/Counter 2 is a 16 bit up counter.
When the counter rolls over from FFFFh, a reload is generated that causes the contents of the
RCAP2L and RCAP2H registers to be reloaded into the TL2 and TH2 registers. The reload action also
sets the TF2 bit. If the EXEN2 bit is set, then a negative transition of T2EX pin will also cause a
reload. This action also sets the EXF2 bit in T2CON.
osc
T2 = P1.0
TR2 = T2CON.2
T2EX = P1.1
T2M = CKCON.5
1/4 1
C/T2 = T2CON.1
0
1/12 0
1
EXEN2 = T2CON.3
TL2 TH2
T2CON.7
TF2
RCAP2L RCAP2H
EXF2
T2CON.6
Timer 2
Interrupt
Figure 15. 16-Bit Auto-reload Mode, Counting Up
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Publication Release Date: 05/31/2004
Revision A1