AT89C5122D-RDRUM datasheet(147/208 Pages) ATMEL

tên linh kiện	AT89C5122D-RDRUM

Giải thích chi tiết về linh kiện	C51 Microcontroller with USB and Smart Card Reader Interfaces

PDF	208 Pages

Scroll/Zoom	100%

nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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147 / 208 page

147

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Figure 91.

Timer/Counter x (x = 0 or 1) in Mode 1

Figure 92.

Mode 1 Overflow Period Formula

Mode 2 (8-bit Timer with Auto-

Reload)

Mode 2 configures Timer 0 as an 8-bit Timer (TL0 register) that automatically reloads

from the TH0 register (see Figure 93). TL0 overflow sets the TF0 flag in the TCON reg-

ister and reloads TL0 with the contents of TH0, which is preset by the software. When

the interrupt request is serviced, the hardware clears TF0. The reload leaves TH0

unchanged. The next reload value may be changed at any time by writing it to the TH0

Figure 94 gives the autoreload period calculation formula when in timer mode.

Figure 93.

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

Figure 94.

Mode 2 Autoreload Period Formula

TRx

TCON reg

TFx

TCON reg

GATEx

TMOD reg

Overflow

Timer x

Interrupt

Request

C/Tx#

TMOD reg

TLx

(8 bits)

THx

(8 bits)

INTx#

CK_Tx

⋅ (65536 – (THx, TLx))

TFxPER =

FCK_Tx

TRx

TCON reg

TFx

TCON reg

GATEx

TMOD reg

Overflow

Timer x

Interrupt

Request

C/Tx#

TMOD reg

TLx

(8 bits)

THx

(8 bits)

INTx#

CK_Tx

TFxPER=

FCK_Tx

⋅ (256 – THx)

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