參數(shù)資料
型號(hào): P83CL882
廠商: NXP Semiconductors N.V.
英文描述: 80C51 Ultra Low Power ULP telephony controller
中文描述: 80C51的超低功耗無(wú)鉛汽油電話控制器
文件頁(yè)數(shù): 40/88頁(yè)
文件大小: 328K
代理商: P83CL882
2001 Jun 19
40
Philips Semiconductors
Product specification
80C51 Ultra Low Power (ULP) telephony controller
P83CL882
6.6.4
A
UTO
-
RELOAD MODE
In the Auto-reload mode, Timer 2 can be configured as
a timer or a counter (T2CON.C/T2 bit) and then
programmed to count up or down. The counting direction
is determined by bit T2MOD.DCEN (down count enable).
When reset is applied, then T2MOD.DCEN is reset which
defaults to counting up. If T2MOD.DCEN is set, Timer 2
can count up when T2EX = 1 and count down when
T2EX = 0.
T2CON.C/T2 = 1: Timer 2 is a 16-bit counter. The
counter increments/decrements at each LOW-to-HIGH
transition on input T2 at a maximum rate of one each
12 f
psc
cycles.
T2CON.C/T2 = 0: Timer 2 is a 16-bit timer. The timer
increments/decrements each 6 f
psc
cycles.
6.6.4.1
T2MOD.DCEN = 0: counting up
In the Auto-reload mode and counting up, registers
T2RCH/T2RCL are used to hold a reload value for
T2H/T2L.
By setting bit T2CON.EXEN2 the external trigger input
T2EX is enabled. When resetting bit T2CON.EXEN2, the
external trigger input T2EX is disabled.
T2CON.EXEN2 = 1: The external trigger input T2EX is
enabled. Timer 2 is a 16-bit timer or counter.
A HIGH-to-LOW transition at input T2EX causes the
value in T2RCH/T2RCL to be reloaded in the Timer 2
T2H/T2L registers, and bit T2CON.EXF2 becomes set.
Also overflowing of Timer 2 causes the value in
T2RCH/T2RCL to be reloaded in the T2H/T2L registers
and sets bit T2CON.TF2.
T2CON.EXEN2 = 0: The external trigger input T2EX is
disabled. Timer 2 is a 16-bit timer or counter. The T2EX
input is ignored. Overflowing of Timer 2 causes the
value in T2RCH/T2RCL to be reloaded in the T2H/T2L
registers and sets bit T2CON.TF2.
Timer 2 interrupt will be set if EXF2 is set or TF2 is set.
The Auto-reload mode (DCEN = 0) is shown in Fig.20.
handbook, full pagewidth
MBH999
TL2
(8 BITS)
COMPARATOR 1
(16 BITS)
TR2
control
TH2
(8 BITS)
COMP2L
COMP2H
ECOMP
RCAP2L
RCAP2H
EXF2
TF2
COMP
Timer 2
interrupt
port
P1.2
EXEN2
control
C/T2 = 1
T2 pin
6
OSC
transition
detector
T2EX pin
C/T2 = 0
reload
Fig.20 Timer 2 in Auto-reload mode (DCEN = 0).
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