AT89C51ED2-RDTUM Atmel, AT89C51ED2-RDTUM Datasheet - Page 64

• Manufacturer Part Number: AT89C51ED2-RDTUM
• Description: IC 8051 MCU FLASH 64K 64VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51ED2-RDTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 50
• 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: 64-TQFP, 64-VQFP
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: UART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 50
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• Cpu Family: AT89
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 40MHz
• Total Internal Ram Size: 2KB
• # I/os (max): 50
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: VQFP
• For Use With: AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Details

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