w77e58 Winbond Electronics Corp America, w77e58 Datasheet - Page 59

• Manufacturer Part Number: w77e58
• Description: 8 Bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

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