ST72F521AR9TC STMicroelectronics, ST72F521AR9TC Datasheet - Page 108

• Manufacturer Part Number: ST72F521AR9TC
• Description: IC MCU 8BIT 60K FLASH 64-TQFP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72F521AR9TC

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: CAN, I²C, SCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 48
• Program Memory Size: 60KB (60K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 3.8 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 64-TQFP, 64-VQFP
• For Use With: 497-6453 - BOARD EVAL BASED ON ST7LNBX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

ST72F521, ST72521B
SERIAL COMMUNICATIONS INTERFACE (Cont’d)
10.6.4.9 Clock Deviation Causes
The causes which contribute to the total deviation
are:
All the deviations of the system should be added
and compared to the SCI clock tolerance:
D
Figure 63. Bit Sampling in Reception Mode
RDI LINE
108/215
Sample
TRA
clock
– D
– D
– D
– D
oscillator error of the transmitter or the trans-
mitter is transmitting at a different baud rate).
tion of the receiver.
receiver: This deviation can occur during the
reception of one complete SCI message as-
suming that the deviation has been compen-
sated at the beginning of the message.
(generally due to the transceivers)
+ D
TRA
QUANT
REC
TCL
: Deviation due to the transmission line
QUANT
: Deviation due to transmitter error (Local
: Deviation of the local oscillator of the
: Error due to the baud rate quantisa-
+ D
1
REC
2
+ D
3
TCL
< 3.75%
4
7/16
5
6
One bit time
7
sampled values
8
10.6.4.10 Noise Error Causes
See also description of Noise error in
10.6.4.3.
Start bit
The noise flag (NF) is set during start bit reception
if one of the following conditions occurs:
1. A valid falling edge is not detected. A falling
2. During sampling of the 16 samples, if one of the
Therefore, a valid Start Bit must satisfy both the
above conditions to prevent the Noise Flag getting
set.
Data Bits
The noise flag (NF) is set during normal data bit re-
ception if the following condition occurs:
– During the sampling of 16 samples, if all three
Therefore, a valid Data Bit must have samples 8, 9
and 10 at the same value to prevent the Noise
Flag getting set.
samples numbered 8, 9 and10 are not the same.
The majority of the 8th, 9th and 10th samples is
considered as the bit value.
edge is considered to be valid if the 3 consecu-
tive samples before the falling edge occurs are
detected as '1' and, after the falling edge
occurs, during the sampling of the 16 samples,
if one of the samples numbered 3, 5 or 7 is
detected as a “1”.
samples numbered 8, 9 or 10 is detected as a
“1”.
9
10
11
12
13
6/16
7/16
14
15
16
Section