w77e58 Winbond Electronics Corp America, w77e58 Datasheet - Page 59
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w77e58
Manufacturer Part Number
w77e58
Description
8 Bit Microcontroller
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W77E58.pdf
(85 pages)
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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.
div. by 4
div. by 64
div. by 1024 osc/256
Mode
Clock Source
EXEN2 = T2CON.3
div. by 4
div. by 64
div. by 1024 osc/512
Mode
TR2 = T2CON.2
Clock Source
T2EX = P1.1
TR2 = T2CON.2
T2EX = P1.1
T2 = P1.0
T2 = P1.0
osc/1
osc/16
input
osc/2
osc/32
input
1/12
1/4
T2M = CKCON.5
0
1
Figure 16. 16-Bit Auto-reload Up/Down Counter
C/T = T2CON.1
0
Figure 17. Baud Rate Generator Mode
1
C/T = T2CON.1
1
0
DCEN = 1
- 59 -
Up Counting Reload Value
Down Counting Reload Value
RCAP2L
0FFh
TL2
RCAP2L
TL2
RCAP2H
0FFh
TH2
Preliminary W77E58
RCAP2H
Publication Release Date: March 1999
TH2
T2CON.6
EXF2
T2CON
TF2
overflow
Timer 2
T2CON.6
EXF2
.7
Interrupt
Timer 2
Revision A1
Interrupt
Timer 2