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FM-1288-GE-400B View Datasheet(PDF) - Unspecified

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FM-1288-GE-400B Datasheet PDF : 60 Pages
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3.3 Accessing Through UART
UART serves as an interface between the FM1288 and a host PC or controller that it can send commands
to program the chip’s parameters. UART is an asynchronous bi-directional serial interface and the
protocol is determined by a start bit, number of character bits, a parity bit and a stop bit.
There are 5 different types of command entries for the FM1288 UART interface. Two synchronize bytes
“FC” and “F3” are required before each command entry. Since the speed of the UART interface is much
slower than the internal clock of FM1288, it is safe to continue a “write” transfer without checking the
status of the data transfer.
There are two access modes: mem_read and reg_read. Mem_read is used to read the memory contents
and save the contents in registers 25 and 26 of FM1288. Reg_read then transfers the register contents
to the UART interface output pin TXD. The micro-controller host will then receive the register contents by
monitoring the TXD pin. No partial command entry is allowed. A partial command entry may cause
system mal-function.
3.4 Examples of Accessing Through UART
The table below provides a few examples of updating parameters in FM1288 through the UART interface.
For more details, please refer to the FM1288 Parameter Tuning Guide.
a. mem_write transfer
FC F3 3B 1E 34 00 55
Table 11: Examples of Accessing through UART
-- write memory 1E34 with 0055
b. mem_read
FC F3 37 1E 34
-- read memory contents of 1E34
c. long_reg_write
FC F3 6A 2A 00 30
-- software reset of the voice processor
d. reg_read
FC F3 60 25
-- read register 25
e. read out contents of memory location 1E34
FC F3 37 1E 34
FC F3 60 26
-- MSB of 1E34 will transmit through TXD
FC F3 60 25
-- LSB of 1E34 will transmit through TXD
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