參數(shù)資料
型號(hào)： UPSD3214AV-24U1T
廠商： 意法半導(dǎo)體
英文描述： Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM
中文描述： 閃存可編程系統(tǒng)設(shè)備與8032微控制器核心和64Kbit SRAM的
文件頁(yè)數(shù)： 56/176頁(yè)
文件大?。?/td> 1081K
代理商： UPSD3214AV-24U1T
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μ
PSD323X
56/176
Figure 24. Timer/Counter Mode 3: Two 8-bit Counters
Mode 2.
Mode 2 configures the Timer register as
an 8-bit Counter (TL1) with automatic reload, as
shown in Figure 23. Overflow from TL1 not only
sets TF1,but also reloads TL1 with the contents of
TH1, which is preset by software. The reload
leaves TH1 unchanged. Mode 2 operation is the
same for Timer/Counter 0.
Mode 3.
Timer 1in Mode3 simply holds its count.
The effect is the same as setting TR1 = 0.
Timer 0 inMode 3 establishes TL0 and TH0as two
separate counters. The logic for Mode 3 on Timer
0 is shown in Figure 24.TL0 uses the Timer 0 con-
trol Bits: C/T, GATE, TR0, INT0, and TF0. TH0 is
locked into a timer function (counting machine cy-
cles) and takes over the use of TR1 and TF1 from
Timer 1. Thus, TH0 now controls the “Timer 1“ in-
terrupt.
Mode 3 is provided for applications requiring an
extra 8-bit timer on the counter. With Timer 0 in
Mode 3, an
μ
PSD323X Devices can look like it has
three Timer/Counters.When Timer 0 isin Mode 3,
Timer 1 canbe turned on and off by switching it out
of and into its own Mode 3, or can still be used by
the serial port as a baud rate generator, or in fact,
in any application not requiring an interrupt.
Timer 2
Like timer 0 and 1, timer2 can operateas eitheran
event timer or as an event counter. This is select-
ed by Bit C/T2 in the special function register
T2CON. It has three operating modes: capture,
autoload, and baud rate generator, which are se-
lected by bits in theT2CON as shown in Table 41.
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 over-
flow bit, which can be used to generate an inter-
rupt. 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 cur-
rent value in the Timer 2 registers, TL2 and TH2,
to be captured into registers RCAP2L and
RCAP2H, respectively. In addition, the transition
at T2EX causes Bit EXF2 in T2CON to be set, and
EXF2 likeTF2 cangeneratean interrupt. The Cap-
ture Mode is illustrated in Figure 25.
In the Auto-reload Mode, there are again two op-
tions, which are selected by bit EXEN2 in T2CON.
If EXEN2 = 0, then when Timer 2 rolls over it not
only sets TF2 but also causes the Timer 2 regis-
ters to be reloaded with the 16-bit value in regis-
ters RCAP2L and RCAP2H, which are preset by
software. 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 will also trigger
the 16-bit reload and set EXF2. The Auto-reload
Mode is illustrated in Standard Serial Interface
(UART) Figure 26. The Baud Rate Generation
Mode is selected by (RCLK, RCLK1)=1 and/or
(TCLK, TCLK1)=1. It will be described in conjunc-
tion with the serial port.
AI06624
f
OSC
TF0
Interrupt
Gate
TR0
INT0 pin
T0 pin
Control
TL0
(8 bits)
C/T = 0
C/T = 1
÷
12
f
OSC
TF1
Interrupt
Control
TH1
(8 bits)
÷
12
TR1
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PDF描述
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