AT89C51IC2-SLRUM Atmel, AT89C51IC2-SLRUM Datasheet - Page 17
AT89C51IC2-SLRUM
Manufacturer Part Number
AT89C51IC2-SLRUM
Description
IC 8051 MCU 32K FLASH 44-PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51IC2-SLRIM.pdf
(147 pages)
Specifications of AT89C51IC2-SLRUM
Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
34
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
1.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
For Use With
AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCU
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Other names
AT89C51IC2-SLRUMTR
Available stocks
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Manufacturer
Quantity
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Functional Block
Diagram
Figure 3. Functional Oscillator Block Diagram
Operating Modes
Reset
Functional Modes
Normal Modes
4301D–8051–02/08
XtalA1
XtalA2
PwdOscA
XtalB1
XtalB2
OSCCON
OscAEn
OscA
PwdOscB
FOSCA
OSCCON
OscB
OscBEn
:2
Reset
A hardware RESET puts the Clock generator in the following state:
The selected oscillator depends on OSC bit in Hardware Security Byte (HSB)
Table 84)
HSB.OSC = 1 (Oscillator A selected)
•
•
HSB.OSC = 0 (Oscillator B selected)
•
•
•
•
•
OscAEn = 1 & OscBEn = 0: OscA is running, OscB is stopped.
CKS = 1: OscA is selected for CPU.
OscAEn = 0 & OscBEn = 1: OscB is running, OscA is stopped.
CKS = 0: OscB is selected for CPU.
CPU and Peripherals clock depend on the software selection using CKCON0,
CKCON1 and CKRL registers
CKS bit in CKSEL register selects either OscA or OscB
CKRL register determines the frequency of the OscA clock.
CKCON0
CKRL
X2
0
1
Prescaler-Divider
8-bit
Reload
CKRL=0xFF?
FOSCB
1
0
CKSEL
CKS
1
0
:128
Idle
CLK
PERIPH
CLK
CPU
Sub
Clock
Peripheral Clock
CPU clock
(see HSB
17
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