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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)： | 39/88頁(yè) |
| 文件大小： | 328K |
| 代理商： | P83CL882 |
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2001 Jun 19
39
Philips Semiconductors
Product specification
80C51 Ultra Low Power (ULP) telephony controller
P83CL882
6.6.2
T
IMER
2
MODES IN GENERAL
Timer 2 can operate in three different modes:
Capture mode
Auto-reload mode
Clock output mode.
Inthesethreemodesthetimer/counteroperatesonevents
detected on inputs T2 and T2EX.
Table 52showsthelistofT2CONandT2MODregisterbits
which set the Timer 2 mode of operation.
Sections 6.6.3 to 6.6.5 describe the Timer 2 modes.
Table 52
Timer 2 modes
6.6.3
C
APTURE MODE
In the Capture mode, registers T2RCH/T2RCL are used to
capture the T2H/T2L register data.
There are two options selected by the T2CON.EXEN2 bit.
This bit enables or disables the events of the external
trigger input T2EX.
T2CON.C/T2 = 1: Timer 2 is a 16-bit counter. The
counter increments 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 each 6 f
PSC
cycles.
T2CON.EXEN2 = 1: The external trigger input T2EX is
enabled. Timer 2 is a 16-bit timer or counter.
– If T2MOD.DCEN = 0, a HIGH-to-LOW transition at
input T2EX causes the current Timer 2 value
(T2H/T2L data) to be captured into T2RCH/T2RCL,
and bit T2CON.EXF2 becomes set.
– If T2MOD.DCEN = 1, bit T2CON.EXEN2 has no
influence. Overflowing of Timer 2 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 sets bit
T2CON.TF2.
The Capture mode is shown in Fig.19.
CP/RL2 C/T2OE
C/T2
OPERATING MODE
0
1
0
0
0
1
X
X
0
16-bit auto-reload
16-bit capture
clock output
handbook, full pagewidth
MBH998
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
capture
Fig.19 Timer 2 in Capture mode.
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