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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的超低功耗無鉛汽油電話控制器 |
| 文件頁數(shù)： | 41/88頁 |
| 文件大小： | 328K |
| 代理商： | P83CL882 |
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2001 Jun 19
41
Philips Semiconductors
Product specification
80C51 Ultra Low Power (ULP) telephony controller
P83CL882
6.6.4.2
T2MOD.DCEN = 1: T2EX = 1: counting up
The HIGH value of the external trigger input T2EX sets
Timer 2 to a count-up mode. In the Auto-reload mode and
counting up, registers T2RCH/T2RCL are used to hold
a reloadvalueforT2H/T2L.OverflowingofTimer 2causes
the value in T2RCH/T2RCL to be reloaded in the T2H/T2L
registers, sets bit T2CON.TF2 and toggles bit
T2CON.EXF2 (T2CON.EXF2 can be used as 17th bit if
desired). Timer 2 interrupt will be set if TF2 is set.
6.6.4.3
T2MOD.DCEN = 1: T2EX = 0: counting down
The LOW value of the external trigger input T2EX sets
Timer 2 to a count down mode.
In the Auto-reload mode and counting down, registers
T2RCH/T2RCL are used to hold a value for detecting an
underflow of T2H/T2L. Underflow occurs if the contents of
T2H/T2L matches the contents of T2RCH/T2RCL. Upon
underflow, bit TF2 will be set and registers T2H/T2L will be
loaded with FFFFH, bit T2CON.TF2 is set and bit
T2CON.EXF2 toggles (T2CON.EXF2 can be used as
17th bit if desired).
Note that a Timer 2 roll over from 0000H to FFFFH is not
considered as an underflow (only when
T2RCH/T2RCL = 0000H). Timer 2 interrupt will be set if
TF2 is set.
The Auto-reload mode (DCEN = 1) is shown in Fig.21.
MGT296
T2L
TR2
control
T2H
TF2
down count reload value
upcount reload value
T2RCL
T2RCH
FFH
FFH
EXF2
toggle
T2EX: 1 = count up
0 = count down
Timer 2
interrupt
C/T2 = 1
T2
fpsc
C/T2 = 0
Fig.21 Timer 2 in Auto-reload mode (DCEN = 1).
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