HT85F2270 datasheet(127/226 Pages) HOLTEK

127 / 226 page

Rev. 1.00

1�7 of ��6

�a� 1�� 01�

Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

27 Timer/Event Counters

One of the most fundamental functions in any microcontroller device is the ability to control and

measure time. To implement time related functions each device includes several Timer/Counters.

The Timers are multi-purpose timing units and serve to provide operations such as Timer/Counter,

Input Capture, Compare Match Output and Programmable Clock Output. Each of the Timers has

one individual interrupt. The addition of input and output pins for each Timer ensures that users

are provided with timing units with a wide and flexible range of features.

Timer/Event Counter Summary

The devices contain four Timers, namely Timer 0, Timer 1, Timer 2 and Timer 3. Each individual

Timer is 16-bit wide which are composed of two 8-bit registers, TLn and THn. Timers 0, 1 and 3

have similar structures and similar operating modes. Timer 2 has a different structure and is also

known as a Programmable Counter Array, or PCA for short and has functions such as Compare,

Reload and Capture functions, so called CRC, as well a programmable clock output function. All

timers have a clock divider which provides additional range to the timers.

Various Timer control registers determine how each Timer is operated. The clock sources for the

Timers can come from an internal clock source or from an external timer pin. Note that if the

external timer input function is selected, the respective pin-shared I/O pins should be configured as

input pins.

As Timer 0, 1 and 3 have similar structures they will be described together in their own single

chapter, however as Timer 2 has a very different structure it will be described in a separate chapter.

The main features and differences among the Timers are summarised in the accompanying table.

Timer Function Summary

Function

Timer 0

Timer 1

Timer 2

Timer 3

1�-bit Timer/Counter

√

—

√

16-bit Timer/Counter

√

—

√

8-bit timer with auto-reload

√

—

√

Two 8-bit Timer/Counters

√

—

16-bit Timer/Counter with auto-reload

—

√

—

16-bit Timer/Counter with capture

—

√

—

Compare �atch Output

—

√

—

Programmable Clock Output

—

√

—

HT85F2270 bảng dữ liệu(PDF) 127 Page - Holtek Semiconductor Inc

HT85F2270 bảng dữ liệu(HTML) 127 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL