W77IE58 Datasheet, PDF (63/90 Pages) Winbond – 8-BIT MICROCONTROLLER

Preliminary W77IE58
Clock Source
Mode
div. by 4
div. by 64
input
osc/1
osc/16
div. by 1024 osc/256
1/4
1/12
T2 = P1.0
TR2 = T2CON.2
T2M = CKCON.5
1 ^{C/T = T2CON.1}
0
0
1
Down Counting Reload Value
0FFh 0FFh
TL2
TH2
T2EX = P1.1
RCAP2L RCAP2H
Up Counting Reload Value
DCEN = 1
Figure 16. 16-Bit Auto-reload Up/Down Counter
T2CON .7
TF2
Timer 2
Interrupt
EXF2
T2CON.6
Baud Rate Generator Mode
The baud rate generator mode is enabled by setting either the RCLK or TCLK bits in T2CON register.
While in the baud rate generator mode, Timer/Counter 2 is a 16 bit counter with auto reload when the
count rolls over from FFFFh. However, rolling over does not set the TF2 bit. If EXEN2 bit is set, then a
negative transition of the T2EX pin will set EXF2 bit in the T2CON register and cause an interrupt
request. T2OE bit must be cleared in this mode.
Clock Source
Mode input
div. by 4
osc/2
div. by 64 osc/32
div. by 1024 osc/512
T2 = P1.0
TR2 = T2CON.2
T2EX = P1.1
EXEN2 = T2CON.3
C/T = T2CON.1
0
1
TL2 TH2
Timer 2
overflow
RCAP2L RCAP2H
EXF2
T2CON.6
Timer 2
Interrupt
Figure 17. Baud Rate Generator Mode
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Publication Release Date: July 2000
Revision A1