DF69 datasheet(39/106 Pages) PADAUK

39 / 106 page

DF69

DC Fan Controller

5-9. 8-bit Timer (Timer2)

One 8-bit hardware timer (Timer2) is implemented in the DF69; please refer to Fig. 5-9-1, shown its hardware

diagram. The clock sources of Timer2 may come from system clock (CLK), internal high RC oscillator (IHRC),

internal low RC oscillator (ILRC), PA0, PB0 and PA4, bit [7:4] of register tm2c is used to select the clock

source of Timer2. If IHRC is selected as the clock source, the clock signal sent to Timer2 will keep running

when using ICE in halt state. A clock pre-scaling module is provided with divided-by-1, 4, 16, and 64 options,

controlled by bit [6:5] of tm2s register; one scaling module with divided-by-1~31 is also provided and controlled

by bit [4:0] of tm2s register. In conjunction of pre-scaling function and scaling function, the frequency of Timer2

clock (TM2_CLK) can be wide range and flexible.

The Timer2 counter performs 8-bit up-counting operation only; the 8-bit counter will be clear to zero and

generate interrupt request automatically whenever its values reach to that of bound register tm2b, the bound

Fig. 5-9-1 Timer2 hardware diagram

Fig. 5-9-2 Timing diagram of Timer2

tm2c[7:4]

CLK,

IHRC,

ILRC,

PA0,

~PA0,

PB0,

~PB0,

PA4,

~PA4

Pre-

scalar

1, 4,

16, 64

tm2s[6:5]

Scalar

1 ~ 31

tm2s[4:0]

8-bit

counter

Bound

tm2b[7:0]

To request

interrupt

tm2c[7:4]

CLK,

IHRC,

ILRC,

PA0,

~PA0,

PB0,

~PB0,

PA4,

~PA4

Pre-

scalar

1, 4,

16, 64

tm2s[6:5]

Scalar

1 ~ 31

tm2s[4:0]

8-bit

counter

Bound

tm2b[7:0]

To request

interrupt

Time

Counter

0xFF

Bound values

Time out and

Interrupt request

0x00

Time

Counter

0xFF

Bound values

Time out and

Interrupt request

0x00

Page 39 of 106

PDK-DS-DF69_V003 – Apr. 18, 2018

DF69 Scheda tecnica(PDF) 39 Page - PADAUK Technology.

DF69 Scheda tecnica(HTML) 39 Page - PADAUK Technology.

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

Scheda tecnica Scarica

Link URL