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AT89LP6440 bảng dữ liệu(PDF) 64 Page - ATMEL Corporation

tên linh kiện AT89LP6440
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
PDF  194 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT89LP6440 bảng dữ liệu(HTML) 64 Page - ATMEL Corporation

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3706A–MICRO–9/09
AT89LP6440 - Preliminary
registers, TH2 and TL2, respectively. A logic 0 at T2EX makes Timer 2 count down. The timer
underflows when TH2 and TL2 equal BOTTOM, the 16-bit value stored in RCAP2H and
RCAP2L. The underflow sets the TF2 bit and causes MAX to be reloaded into the timer regis-
ters. The EXF2 bit toggles whenever Timer 2 overflows or underflows and can be used as a 17th
bit of resolution. In this operating mode, EXF2 does not flag an interrupt.
When T2EX = 1 and T2CM
1-0 = 01B, the timer will overflow at TOP and set the TF2 bit. This
overflow also causes MIN to be reloaded into the timer registers. A logic 0 at T2EX makes Timer
2 count down. The timer underflows when TH2 and TL2 equal MIN. The underflow sets the TF2
bit and causes TOP to be reloaded into the timer registers. The behavior of Count Mode 0 ver-
sus Count Mode 0 when DCEN is enabled is shown in Figure 12-6.
Figure 12-4. Timer 2 Diagram: Auto-Reload Mode (T2CM
1-0 = 00B, DCEN = 1)
The timer overflow/underflow rate for up-down counting mode is the same as for up counting
mode, provided that the count direction does not change. Changes to the count direction may
result in longer or shorter periods between time-outs.
Figure 12-5. Timer 2 Diagram: Auto-Reload Mode (T2CM
1-0 = 01B, DCEN = 1)
÷TPS
÷TPS



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