BIG TREE TECH S42C - UART Mode Protocol; UART Read Protocol; UART Write Protocol

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BIG TREE TECH
UART mode protocol format
UART protocol consists of synchronization bits, read/write bits, 8-bit
register address and variable data.
Reads:
sync
data size
w/r
8bit register address
0...4
5...7
8
9...15
1
0
1
0
1
0
0
0
1
register address
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Read instruction: rw(bit 8) is 1 when reading the data of register
address (bit 9-15).
Write:
sync
data size
w/r
8bit register address
data
0...4
5...7
8
9...15
16...31
1
0
1
0
1
0
1
0
0
register address
data bytes 3, 2, 1, 0
(high to low byte)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
...
31
Write instruction: when rw(bit 8) is 0, write the register address (bit
9-15) with the data width defined by data size bits (5-6). The
variable-length data can be received, for example, the data size is 2, and
the data length is two bytes.
Note: The modified register needs to send the save instruction 0x18
before it can be written into Flash.