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AT89C5122D-RDRUM 데이터시트(PDF) 147 Page - ATMEL Corporation

부품명 AT89C5122D-RDRUM
상세설명  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5122D-RDRUM 데이터시트(HTML) 147 Page - ATMEL Corporation

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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
register.
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
0
1
GATEx
TMOD reg
Overflow
Timer x
Interrupt
Request
C/Tx#
TMOD reg
TLx
(8 bits)
THx
(8 bits)
INTx#
Tx
CK_Tx
/6
6
⋅ (65536 – (THx, TLx))
TFxPER =
FCK_Tx
TRx
TCON reg
TFx
TCON reg
0
1
GATEx
TMOD reg
Overflow
Timer x
Interrupt
Request
C/Tx#
TMOD reg
TLx
(8 bits)
THx
(8 bits)
INTx#
Tx
CK_Tx
/6
TFxPER=
FCK_Tx
6
⋅ (256 – THx)



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