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AT85C5122D-RDTUM bảng dữ liệu(PDF) 41 Page - ATMEL Corporation

tên linh kiện AT85C5122D-RDTUM
Giải thích chi tiết về linh kiện  C51 Microcontroller with USB and Smart Card Reader Interfaces
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nhà sản xuất  ATMEL [ATMEL Corporation]
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AT85C5122D-RDTUM bảng dữ liệu(HTML) 41 Page - ATMEL Corporation

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AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
Figure 18.
PLL Programming Flow
Clock Tree Architecture
The clock controller outputs several different clocks as shown in Figure 19:
•
a clock for the CPU core
•
a clock for the peripherals which is used to generate the timers, watchdog, SPI,
UART, and ports sampling clocks. This divided clock will be used to generate the
alternate card clock.
•
a clock for the USB
•
a clock for the SCIB controller
•
a clock for the DC/DC converter
These clocks are enabled or not depending on the power reduction mode as detailed in
Section “Power Management”, page 178.
These clocks are generated using four presacalers defined in the table below:
PLL
Programming
Configure Dividers
N3:0=
xxxxb
R3:0=
xxxxb
Enable PLL
PLLEN= 1
PLL Locked?
PLOCK= 1?
Prescaler
Register
Reload Factor
Function
PR1
CKRL
CKRL[0:3]
CPU & Peripheral clocks
PR2
SCICLK
SCICLK[0:5]
Smart card
PR3
SCSR
ALTKPS[0:1]
Alternate card
PR4
DCCKPS
DCCKPS[3:0]
DC/DC



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