AT89C5122D-PSTUM Atmel, AT89C5122D-PSTUM Datasheet - Page 48
AT89C5122D-PSTUM
Manufacturer Part Number
AT89C5122D-PSTUM
Description
IC 8051 MCU FLASH 32K 64QFN
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C5122D-PSTUM.pdf
(208 pages)
Specifications of AT89C5122D-PSTUM
Core Processor
8051
Core Size
8-Bit
Speed
48MHz
Connectivity
SmartCard, SPI, UART/USART, USB
Peripherals
LED, POR, WDT
Number Of I /o
46
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFN
For Use With
AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-03 - KIT STARTER FOR MCU AT8XC5122/23
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
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USB Interface Clock
Registers
48
AT83R5122, AT8xC5122/23
The USB Interface uses two clocks :
Table 24. Clock Selection Register - CKSEL (S:85h)
Reset Value = XXXX XXX0b
Table 25. Clock Reload Register - CKRL (S:97h)
Reset Value = XXXX 1111b
Bit Number Bit Mnemonic Description
Bit Number Bit Mnemonic Description
–
–
7 - 4
7
7:1
7
3:0
-
-
0
The first one is the CPU clock used for the interface with the microcontroller,
CK_IDLE.
The second one is the CK_USB supplied from the PLL through a divider by
2.
CKRL3:0
6
6
-
-
CKS
-
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
CPU Oscillator Select Bit
Set this bit to connect CPU and Peripherals to PLL output.
Clear this to to connect CPU and Peripherals to XTAL1 clock input.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Clock Reload register
Prescaler1 value
F
ck_cpu
5
5
-
-
=[ 1 / 2*(16-CKRL)] * F
4
4
-
-
CKRL3
3
3
-
ck_XTAL1
CKRL2
2
2
-
CKRL1
1
1
-
4202F–SCR–07/2008
CKRL0
CKS
0
0
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