參數(shù)資料
型號(hào)： P8C15416Y-12
英文描述： IC-8-BIT CMOS CPU
中文描述： 集成電路8位CMOS處理器
文件頁(yè)數(shù)： 9/25頁(yè)
文件大小： 154K
代理商： P8C15416Y-12
80C32/80C52
9
Rev. I
–
September 18, 1998
Figure 6. External Drive Configuration
7. Hardware Description
Same as for the 80C51, plus a third timer/counter.
7.1. Timer/Event Counter 2
Timer 2 is a 16 bit timer/counter like Timers 0 and 1, it can operate either as a timer or as an event counter. This is
selected by bit C/T2 in the Special Function Register T2CON (Figure 1.). It has three operating modes : “capture”,
“autoload” and “baud rate generator”, which are selected by bits in T2CON as shown in Table 2.
In the capture mode there are two options which are selected by bit EXEN2 in T2CON; If EXEN2 = 0, then Timer 2
is a 16 bit timer or counter which upon overflowing sets bit TF2, the Timer 2 overflow bit, which can be used to generate
an interrupt. If EXEN2 = 1, then Timer 2 still does the above, but with the added feature that a 1-to-0 transition at
external input T2EX causes the current value in the Timer 2 registers, TL2 and TH2, to be captured into registers
RCAP2L and RCAP2H, respectively, (RCAP2L and RCAP2H are new Special Function Register in the 80C52). In
addition, the transition at T2EX causes bit EXF2 in T2CON to be set, and EXF2, like TF2, can generate an interrupt.
Table 2. Timer 2 Operating Modes
RCLK +
TCLK
CP/RL2
TR2
MODE
0
0
1
X
0
1
X
X
1
1
1
0
16 bit auto-reload
16 bit capture
baud rate generator
(off)
The capture mode is illustrated in Figure 7.
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