ZHCSR35A November 2019 – August 2020 BQ79600-Q1
PRODUCTION DATA
Communication between host and BQ79600-Q1 can be configured to UART mode, refer to Section 7.3.1.3. The UART interface baud rate is default to 1Mbps at power up or digital reset. The UART interface follows the standard serial protocol of 8-N-1 (see Figure 7-10), where it sends information as a START bit, followed by eight data bits, and then one STOP bit. The STOP bit indicates the end of the byte. The protocol also supports two STOP bits. When the device is configured as 2 stop bits ([TWO_STOP_EN] = 1, stack devices should also be set as two stop bits), the UART response frame from the device to MCU will always return with 2 stop bits.
The UART sends data on the TX pin and receives data on the RX pin. When idle, the TX and RX are high. TX is always pulled to VIO internally while in ACTIVE or SLEEP mode, whether enabled or disabled.
The UART interface is strictly a half-duplex interface. While transmitting, any attempted communication on RX is ignored. The only exception is Section 7.3.2.1.2.1.2.
Note: User can change baud rate using register bit [UART_VIF_BAUD] for debug purpose.