AT89C51ED2-3CSIM Atmel, AT89C51ED2-3CSIM Datasheet - Page 64
![IC 8051 MCU FLASH 64K 40DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
AT89C51ED2-3CSIM
Manufacturer Part Number
AT89C51ED2-3CSIM
Description
IC 8051 MCU FLASH 64K 40DIP
Manufacturer
Atmel
Series
89Cr
Datasheet
1.ATWEBDVK-02RC.pdf
(137 pages)
Specifications of AT89C51ED2-3CSIM
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
Eeprom Size
2K x 8
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
40-DIP (0.600", 15.24mm)
Data Bus Width
8 bit
Data Ram Size
64 KB
Interface Type
SPI, UART
Maximum Clock Frequency
60 MHz
Number Of Programmable I/os
32
Number Of Timers
3 x 16 bit
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
-
Lead Free Status / Rohs Status
No
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89C51ED2-3CSIM
Manufacturer:
ATMEL
Quantity:
77 760
16.2.3
16.2.4
16.2.5
64
AT89C51RD2/ED2
SPI Serial Clock (SCK)
Slave Select (SS)
Baud Rate
This signal is used to synchronize the data movement both in and out of the devices through
their MOSI and MISO lines. It is driven by the Master for eight clock cycles which allows to
exchange one Byte on the serial lines.
Each Slave peripheral is selected by one Slave Select pin (SS). This signal must stay low for any
message for a Slave. It is obvious that only one Master (SS high level) can drive the network.
The Master may select each Slave device by software through port pins
vent bus conflicts on the MISO line, only one slave should be selected at a time by the Master
for a transmission.
In a Master configuration, the SS line can be used in conjunction with the MODF flag in the SPI
Status register (SPSTA) to prevent multiple masters from driving MOSI and SCK (see Error
conditions).
A high level on the SS pin puts the MISO line of a Slave SPI in a high-impedance state.
The SS pin could be used as a general-purpose if the following conditions are met:
Note:
In Master mode, the baud rate can be selected from a baud rate generator which is controlled by
three bits in the SPCON register: SPR2, SPR1 and SPR0.The Master clock is selected from one
of seven clock rates resulting from the division of the internal clock by 2, 4, 8, 16, 32, 64 or 128.
Table 16-1
Table 16-1.
• The device is configured as a Master and the SSDIS control bit in SPCON is set. This kind of
• The Device is configured as a Slave with CPHA and SSDIS control bits set
SPR2
configuration can be found when only one Master is driving the network and there is no way
that the SS pin could be pulled low. Therefore, the MODF flag in the SPSTA will never be
set
configuration can happen when the system comprises one Master and one Slave only.
Therefore, the device should always be selected and there is no reason that the Master uses
the SS pin to select the communicating Slave device.
0
0
0
0
1
1
1
1
(1)
.
1. Clearing SSDIS control bit does not clear MODF.
2. Special care should be taken not to set SSDIS control bit when CPHA = ’0’ because in this
mode, the SS is used to start the transmission.
gives the different clock rates selected by SPR2:SPR1:SPR0.
SPR1
SPI Master Baud Rate Selection
0
0
1
1
0
0
1
1
SPR0
0
1
0
1
0
1
0
1
F
F
F
F
F
F
CLK PERIPH
F
CLK PERIPH
CLK PERIPH
CLK PERIPH
Clock Rate
CLK PERIPH
CLK PERIPH
CLK PERIPH
Don’t Use
/128
/16
/32
/64
/8
/2
/4
Baud Rate Divisor (BD)
(Figure
No BRG
(2)
128
16
32
64
. This kind of
2
4
8
16-2). To pre-
4235K–8051–05/08