參數(shù)資料
型號(hào)： P83C524EBA
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-bit microcontrollers
中文描述： 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 27/76頁(yè)
文件大?。?/td> 400K
代理商： P83C524EBA
1997 Dec 15
27
Philips Semiconductors
Product specification
8-bit microcontrollers
P83C524; P80C528; P83C528
11.2.2
C
APTURE
M
ODE
In the capture mode (see Fig.14) there are two options
which are selected by bit EXEN2 in T2CON. If EXEN2 = 0,
then Timer 2 is a 16-bit timer/counter which on overflow
sets bit TF2 (Timer 2 overflow bit). TF2 can be used to
generate an interrupt. If EXEN2 = 1, Timer 2 operates as
above, with the added feature that a HIGH-to-LOW
transition at the external input T2EX causes the current
value in Timer 2 registers (TL2 and TH2) to be captured
into registers RCAP2L and RCAP2H, respectively. The
HIGH-to-LOW transition of T2EX also causes bit EXF2 in
T2CON to be set. EXF2 can be used to generate an
interrupt.
11.2.3
A
UTOMATIC
R
ELOAD
M
ODE
In the automatic reload mode (see Fig.15)there are two
options which are selected by bit EXEN2 in T2CON. If
EXEN2 = 0, then a Timer 2 overflow sets TF2 and causes
the Timer 2 registers to be reloaded with the 16-bit value
in registers RCAP2L and RCAP2H, which are preset by
software.
If EXEN2 = 1, Timer 2 operates as above, with the added
feature that a HIGH-to-LOW transition at the external input
T2EX triggers the 16-bit reload and sets EXF2.
11.2.4
B
AUD
R
ATE
G
ENERATOR
M
ODE
The baud rate generator mode (see Fig.16) is selected by
RCLK = 1 and/or TCLK = 1 in T2CON. Overflows of either
Timer 2 or Timer 1 can be used independently for
generating baud rates for transmit and receive. The baud
rate generation by Timer 1 and/or Timer 2 is used for the
Serial Port in Mode 1 and Mode 3. The baud rate
generation mode is similar to the automatic reload mode,
in that a rollover in TH2 causes the Timer 2 registers to be
reloaded with the 16-bit value in registers RCAP2L and
RCAP2H, which are preset by software. The baud rate for
the Serial Port in Modes 1 and 3 are determined by
Timer 2's overflow rate as follows:
Timer 2 can be configured for either 'timer' or 'counter'
operation. In timer operation a prescaler divides the
oscillator frequency by 2 (by 12 in the previous modes) and
the baud rate is given by the formula:
In this mode an overflow of Timer 2 does not set TF2. If
EXEN2 = 1, a HIGH-to-LOW transition at pin T2EX sets
EXF2 and can be used to generate an interrupt.
Baud Rate
Timer 2 16
=
Baud Rate
65536
RCAP2H RCAP2L
(
–
32
,
)
]
[
×
--------------------------oscillator frequency
=
Fig.14 Timer 2 in capture mode.
handbook, full pagewidth
MBC468 - 1
TL2
(8 BITS)
TR2
control
TH2
(8 BITS)
RCAP2L
RCAP2H
EXF2
TF2
timer 2
interrupt
EXEN2
control
C/T2 = 1
T2 PIN
12
OSC
transition
detector
T2EX PIN
C/T2 = 0
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