Atmel AT85DVK-07 Especificaciones descargar pdf (Pagina 68)

AT85C51SND3Bx

7632A–MP3–03/06

Figure 36. Timer/Counter x (x = 0 or 1) in Mode 2

Figure 37. Mode 2 Auto-reload Period Formula

Mode 3 (2 x 8-bit Timers) Mode 3 configures Timer 0 such that registers TL0 and TH0 operate as separate 8-bit

Timers (see

Figure 38). This mode is provided for applications requiring an additional 8-

bit Timer or Counter. TL0 uses the Timer 0 control bits C/T0# and GATE0 in TMOD reg-

ister, and TR0 and TF0 in TCON register in the normal manner. TH0 is locked into a

Timer function (counting F

TF1

/6) and takes over use of the Timer 1 interrupt (TF1) and

run control (TR1) bits. Thus, operation of Timer 1 is restricted when Timer 0 is in mode

Figure 39 gives the auto-reload period calculation formulas for both TF0 and TF1

flags.

Figure 38. Timer/Counter 0 in Mode 3: 2 8-bit Counters

Figure 39. Mode 3 Overflow Period Formula

TFx

TCON reg

Overflow

Timer x

Interrup

Reques

TLx

(8 bits)

THx

(8 bits)

GATEx

TMOD Reg

C/Tx#

TMOD Reg

INTx

TIMx

CLOCK

÷ 6

TRx

TCON Reg

TFx

PER

TIMx

6 ⋅ (256 – THx)

TF1

TCON.7

TF0

TCON.5

GATE0

TMOD.3

Overflow

Timer 0

Interrup

Reques

C/T0#

TMOD.2

INTx

TIM0

CLOCK

÷ 6

TR0

TCON.4

TL0

(8 bits)

Overflow

Timer 1

Interrup

Reques

TH0

(8 bits)

TIM0

CLOCK

÷ 6

TR1

TCON.6

TF0

PER

TIM0

6 ⋅ (256 – TL0)

TF1

PER

TIM0

6 ⋅ (256 – TH0)

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 262 263

Comentarios a estos manuales

Sin comentarios

Atmel AT85DVK-07 Especificaciones Pagina 68

Comentarios a estos manuales

Relacionado con productos y manuales para Redes Atmel AT85DVK-07