AT89C51RD2-SLSIM Atmel, AT89C51RD2-SLSIM Datasheet - Page 19

• Manufacturer Part Number: AT89C51RD2-SLSIM
• Description: IC 8051 MCU FLASH 64K 44PLCC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RD2-SLSIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K 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: AT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

4235K–8051–05/08
Reset Value = 0000 000’HSB. X2’b (See “Hardware Security Byte”)
Not bit addressable
Table 7-2.
CKCON1 - Clock Control Register (AFh)
Number
Number
Bit
Bit
5
4
3
2
1
0
7
6
5
4
3
7
-
Mnemonic
Mnemonic
CKCON1 Register
PCAX2
T2X2
T1X2
T0X2
SIX2
Bit
Bit
X2
6
-
-
-
-
-
-
Description
Programmable Counter Array Clock
(This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no
effect).
Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock
periods per peripheral clock cycle.
Enhanced UART Clock (Mode 0 and 2)
(This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no
effect).
Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock
periods per peripheral clock cycle.
Timer2 Clock
(This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no
effect).
Cleared to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
Timer1 Clock
(This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no
effect).
Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock
periods per peripheral clock cycle.
Timer0 Clock
(This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no
effect).
Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock
periods per peripheral clock cycle.
CPU Clock
Cleared to select 12 clock periods per machine cycle (STD mode) for CPU and all the
peripherals. Set to select 6 clock periods per machine cycle (X2 mode) and to enable the
individual peripherals’X2’ bits. Programmed by hardware after Power-up regarding
Hardware Security Byte (HSB), Default setting, X2 is cleared.
Description
Reserved
Reserved
Reserved
Reserved
Reserved
5
-
4
-
3
-
AT89C51RD2/ED2
2
-
1
-
SPIX2
0
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