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AT89C5122D-RDRUM датащи(PDF) 146 Page - ATMEL Corporation

номер детали AT89C5122D-RDRUM
подробное описание детали  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5122D-RDRUM датащи(HTML) 146 Page - ATMEL Corporation

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AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
For normal Timer operation (GATE0= 0), setting TR0 allows TL0 to be incremented by
the selected input. Setting GATE0 and TR0 allows external pin INT0# to control Timer
operation.
Timer 0 overflow (count rolls over from all 1s to all 0s) sets the TF0 flag and generates
an interrupt request.
It is important to stop the Timer/Counter before changing modes.
Mode 0 (13-bit Timer)
Mode 0 configures Timer 0 as a 13-bit Timer which is set up as an 8-bit Timer (TH0 reg-
ister) with a modulo-32 prescaler implemented with the lower five bits of the TL0 register
(see Figure 89). The upper three bits of the TL0 register are indeterminate and should
be ignored. Prescaler overflow increments the TH0 register.
Figure 90 gives the overflow period calculation formula.
Figure 89.
Timer/Counter x (x= 0 or 1) in Mode 0
Figure 90.
Mode 0 Overflow Period Formula
Mode 1 (16-bit Timer)
Mode 1 configures Timer 0 as a 16-bit Timer with the TH0 and TL0 registers connected
in a cascade (see Figure 91). The selected input increments the TL0 register.
Figure 92 gives the overflow period calculation formula when in timer mode.
TRx
TCON reg
TFx
TCON reg
0
1
GATEx
TMOD reg
Overflow
Timer x
Interrupt
Request
C/Tx#
TMOD reg
TLx
(5 bits)
THx
(8 bits)
INTx#
Tx
CK_Tx
/6
6
⋅ (16384 – (THx, TLx))
TFxPER =
FCK_Tx



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