SLASEC8C February 2017 – February 2023 PGA460-Q1
PRODUCTION DATA
The sync field is the first field in every frame that is transmitted by the controller. The sync field is used by the PGA460-Q1 device to confirm the correct baud rate of the frame that is send by the controller. This bit width is used to accurately receive all subsequent fields transmitted by the controller. The bit width is defined as the number of internal oscillator clock periods that make up an entire bit of data transmitted by the controller. This bit width is measured by counting the number of peripheral oscillator clocks in the entire length of the sync field data, and then dividing by 8. #X4342 shows the format of the sync field.
Consecutive sync-field bits are measured, including the start and stop bits, and compared to determine if a valid sync field is being transmitted to the PGA460-Q1 device is valid. If the difference in bit widths of any two consecutive sync field bits is greater than ±25%, then the PGA460-Q1 device ignores the rest of the UART frame; essentially, the PGA460-Q1 device does not respond to the UART message.