AT89C5131A-RDTIL Atmel, AT89C5131A-RDTIL Datasheet - Page 14
AT89C5131A-RDTIL
Manufacturer Part Number
AT89C5131A-RDTIL
Description
IC 8051 MCU FLASH 32K USB 64VQFP
Manufacturer
Atmel
Series
AT89C513xr
Specifications of AT89C5131A-RDTIL
Core Processor
C52X2
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, SPI, UART/USART, USB
Peripherals
LED, POR, PWM, WDT
Number Of I /o
34
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
1.25K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
For Use With
AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-05 - KIT STARTER FOR AT89C5131
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
-
Other names
AT89C5131-RDTIL
Available stocks
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Part Number
Manufacturer
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Price
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PLL
PLL Description
Figure 9. PLL Block Diagram and Symbol
14
AT89C5131A-L
CLOCK
OSC
N divider
N3:0
Figure 8. Crystal Connection
The AT89C5131A-L PLL is used to generate internal high frequency clock (the USB
Clock) synchronized with an external low-frequency (the Peripheral Clock). The PLL
clock is used to generate the USB interface clock. Figure 9 shows the internal structure
of the PLL.
The PFLD block is the Phase Frequency Comparator and Lock Detector. This block
makes the comparison between the reference clock coming from the N divider and the
reverse clock coming from the R divider and generates some pulses on the Up or Down
signal depending on the edge position of the reverse clock. The PLLEN bit in PLLCON
register is used to enable the clock generation. When the PLL is locked, the bit PLOCK
in PLLCON register (see Figure 9) is set.
The CHP block is the Charge Pump that generates the voltage reference for the VCO by
injecting or extracting charges from the external filter connected on PLLF pin (see
Figure 10). Value of the filter components are detailed in the Section “DC
Characteristics”.
The VCO block is the Voltage Controlled Oscillator controlled by the voltage V
duced by the charge pump. It generates a square wave signal: the PLL clock.
Figure 10. PLL Filter Connection
The typical values are: R = 100 Ω, C1 = 10 nf, C2 = 2.2 nF.
PLLCON.1
PLLCON.0
PLOCK
PLLEN
USBclk
PFLD
Down
=
Up
OSCclk
---------------------------------------------- -
R divider
R3:0
PLLF
CHP
PLLF
N
VSS
+
×
1
(
R
+
Vref
C1
C2
1
)
VSS
R
VCO
C1
Q
VSS
X1
X2
C2
USB Clock Symbol
USB Clock
CLOCK
USB
4338F–USB–08/07
REF
pro-
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