AT89C51ID2-RLRIM Atmel, AT89C51ID2-RLRIM Datasheet - Page 102
![IC MCU FLASH 8051 64K 5V 44-VQFP](/photos/6/92/69202/313-44-vqfp_sml.jpg)
AT89C51ID2-RLRIM
Manufacturer Part Number
AT89C51ID2-RLRIM
Description
IC MCU FLASH 8051 64K 5V 44-VQFP
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51ID2-RLTUM.pdf
(157 pages)
Specifications of AT89C51ID2-RLRIM
Core Processor
8051
Core Size
8-Bit
Speed
60MHz
Connectivity
I²C, 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
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
-
Other names
AT89C51ID2RLRIMTR
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Figure 39. Data Transmission Format (CPHA = 0)
Figure 40. Data Transmission Format (CPHA = 1)
Figure 41. CPHA/SS Timing
4289C–8051–11/05
MOSI (from Master)
SCK Cycle Number
MISO (from Slave)
MOSI (from Master)
SCK (CPOL = 0)
SCK (CPOL = 1)
MISO (from Slave)
SCK Cycle Number
SPEN (Internal)
SCK (CPOL = 1)
SCK (CPOL = 0)
Capture Point
SPEN (Internal)
SS (to Slave)
Capture Point
SS (to Slave)
MISO/MOSI
(CPHA = 0)
(CPHA = 1)
Master SS
Slave SS
Slave SS
As shown in Figure 39, the first SCK edge is the MSB capture strobe. Therefore, the
Slave must begin driving its data before the first SCK edge, and a falling edge on the SS
pin is used to start the transmission. The SS pin must be toggled high and then low
between each Byte transmitted (Figure 41).
Figure 40 shows an SPI transmission in which CPHA is ’1’. In this case, the Master
begins driving its MOSI pin on the first SCK edge. Therefore, the Slave uses the first
SCK edge as a start transmission signal. The SS pin can remain low between transmis-
sions (Figure 41). This format may be preffered in systems having only one Master and
only one Slave driving the MISO data line.
MSB
MSB
MSB
1
MSB
1
2
bit6
bit6
2
bit6
bit6
Byte 1
3
bit5
bit5
3
bit5
bit5
bit4
bit4
4
bit4
4
bit4
Byte 2
bit3
5
bit3
bit3
bit3
5
6
bit2
bit2
6
bit2
bit2
Byte 3
7
bit1
bit1
7
bit1
bit1
LSB
8
8
LSB
LSB
LSB
AT89C51ID2
102
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