AT89C5122D-SISUM Atmel, AT89C5122D-SISUM Datasheet - Page 45
AT89C5122D-SISUM
Manufacturer Part Number
AT89C5122D-SISUM
Description
IC 8051 MCU FLASH 32K 28PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C5122D-PSTUM.pdf
(208 pages)
Specifications of AT89C5122D-SISUM
Core Processor
8051
Core Size
8-Bit
Speed
48MHz
Connectivity
SmartCard, SPI, UART/USART, USB
Peripherals
LED, POR, WDT
Number Of I /o
14
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
28-PLCC
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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Use of PLL Clock
4202F–SCR–07/2008
When the CPU clock is fed by the PLL, the X2 mode is forbidden. The bit X2 must
always remain cleared in CKCON0 register. As the PR1 prescaler is always different
from 1/2, the usual X1 mode can not be defined. So it is necessary to define an equiva-
lent X1 or X2 mode from equivalent clock circuits, as in previous section.
Example: PR1=1/4, PLL feeds the CPU. The CPU works in this case at 24 MHz. This
frequency could also be obtained by an equivalent clock circuit where the on-chip oscil-
lator would run at 48 MHz in X1 mode or at 24 Mhz in X2 mode. So we can say that in
this configuration, the CPU works at 48 MHz / X1 or 24 MHz / X2 (See figures below).
As the X2 bit is cleared in CKCON0 register, we have always F
External Clock
External Clock
Crystal
2 MHz
1 MHz
8 MHz
X2 mode selected
X1 mode selected
PR1 Prescaler
1/8
1/2
AT83R5122, AT8xC5122/23
(Equivalent to)
(Equivalent to)
CPU frequency
PERIPH frequency
CPU frequency
PERIPH frequency
CPU frequency
PERIPH frequency
1 MHz
1 MHz
1 MHz
1 MHz
1 MHz
1 MHz
CK_IDLE
= F
CK_PERIPH
.
45
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