AT90CAN128-16MI Atmel, AT90CAN128-16MI Datasheet - Page 184
![IC MCU AVR FLASH 128K 64-QFN](/photos/12/13/121326/313-64-qfn_sml.jpg)
AT90CAN128-16MI
Manufacturer Part Number
AT90CAN128-16MI
Description
IC MCU AVR FLASH 128K 64-QFN
Manufacturer
Atmel
Series
AVR® 90CANr
Specifications of AT90CAN128-16MI
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
CAN, EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
For Use With
ATDVK90CAN1 - KIT DEV FOR AT90CAN128 MCU
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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17.7.1
184
AT90CAN32/64/128
Sending Frames with 5 to 8 Data Bit
chronous operation is used, the clock on the XCKn pin will be overridden and used as
transmission clock.
A data transmission is initiated by loading the transmit buffer with the data to be transmitted. The
CPU can load the transmit buffer by writing to the UDRn I/O location. The buffered data in the
transmit buffer will be moved to the Shift Register when the Shift Register is ready to send a new
frame. The Shift Register is loaded with new data if it is in idle state (no ongoing transmission) or
immediately after the last stop bit of the previous frame is transmitted. When the Shift Register is
loaded with new data, it will transfer one complete frame at the rate given by the Baud Register,
U2Xn bit or by XCKn depending on mode of operation.
The following code examples show a simple USART0 transmit function based on polling of the
Data Register Empty (UDRE0) flag. When using frames with less than eight bits, the most signif-
icant bits written to the UDR0 are ignored. The USART0 has to be initialized before the function
can be used. For the assembly code, the data to be sent is assumed to be stored in Register
R16
Note:
The function simply waits for the transmit buffer to be empty by checking the UDRE0 flag, before
loading it with new data to be transmitted. If the Data Register Empty interrupt is utilized, the
interrupt routine writes the data into the buffer.
Assembly Code Example
C Code Example
.
USART0_Transmit:
void USART0_Transmit (unsigned char data)
{
}
; Wait for empty transmit buffer
lds
sbrs
rjmp
; Put data (r16) into buffer, sends the data
sts
ret
/* Wait for empty transmit buffer */
while ( ! ( UCSRA0 & (1<<UDRE0)));
/* Put data into buffer, sends the data */
UDR0 = data;
1. The example code assumes that the part specific header file is included.
r17, UCSR0A
r17, UDRE0
USART0_Transmit
UDR0, r16
(1)
(1)
7679H–CAN–08/08
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