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W77E516 Datasheet

  • W77E516

  • uC-Based Consumer IC > Controller IC > 8-Bit Microcontrolle...

  • 1107.54KB

  • Winbond

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Preliminary W77E516
Auto-reload Mode, Counting Up/Down
Timer/Counter 2 will be in auto-reload mode as an up/down counter if CP/ RL2 bit in T2CON is
cleared and the DCEN bit in T2MOD is set. In this mode, Timer/Counter 2 is an up/down counter
whose direction is controlled by the T2EX pin. A 1 on this pin cause the counter to count up. An
overflow while counting up will cause the counter to be reloaded with the contents of the capture
registers. The next down count following the case where the contents of Timer/Counter equal the
capture registers will load an FFFFh into Timer/Counter 2. In either event a reload will set the TF2
bit. A reload will also toggle the EXF2 bit. However, the EXF2 bit can not generate an interrupt while
in this mode.
Down Counting Reload Value
T2M = CKCON.5
Clock Source
Mode
input
div. by 4
osc/1
div. by 64 osc/16
div. by 1024 osc/256
0FFh
0FFh
1/4
1/12
1
0
C/T = T2CON.1
0
T2CON.7
TL2
TH2
1
T2 = P1.0
TR2 = T2CON.2
TF2
Timer 2
Interrupt
RCAP2L
RCAP2H
T2EX = P1.1
Up Counting Reload Value
EXF2
T2CON.6
DCEN = 1
Figure 16. 16-Bit Auto-reload Up/Down Counter
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.
Clock Source
Mode
input
div. by 4
osc/2
div. by 64
osc/32
div. by 1024 osc/512
C/T = T2CON.1
0
TL2
TH2
1
T2 = P1.0
TR2 = T2CON.2
T2EX = P1.1
Timer 2
overflow
RCAP2L RCAP2H
EXEN2 = T2CON.3
EXF2
T2CON.6
Figure 17. Baud Rate Generator Mode
Timer 2
Interrupt
- 61 -
Publication Release Date: August 16, 2002
Revision A1

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