bc41b143a07 ETC-unknow, bc41b143a07 Datasheet - Page 70

• Manufacturer Part Number: bc41b143a07
• Description: Single Chip Bluetooth
• Manufacturer: ETC-unknow

9.6.2
To write to BlueCore4-ROM, the 8-bit write command (00000010) is sent first (C[7:0]) followed by a 16-bit address
(A[15:0]). The next 16-bits (D[15:0]) clocked in on SPI_MOSI are written to the location set by the address (A).
Thereafter for each subsequent 16-bits clocked in, the address (A) is incremented and the data written to consecutive
locations until the transaction terminates when SPI_CSB is taken high.
9.6.3
Reading from BlueCore4-ROM is similar to writing to it. An 8-bit read command (00000011) is sent first (C[7:0]),
followed by the address of the location to be read (A[15:0]).BlueCore4-ROM then outputs on SPI_MISO a check word
during T[15:0] followed by the 16-bit contents of the addressed location during bits D[15:0].
The check word is composed of {command, address [15:8]}. The check word may be used to confirm a read operation
to a memory location. This overcomes the problems encountered with typical serial peripheral interface slaves,
whereby it is impossible to determine whether the data returned by a read operation is valid data or the result of the
slave device not responding.
If SPI_CSB is kept low, data from consecutive locations is read out on SPI_MISO for each subsequent 16 clocks, until
the transaction terminates when SPI_CSB is taken high.
9.6.4
BlueCore4-ROM should not be connected in a multi-slave arrangement by simple parallel connection of slave MISO
lines. When BlueCore4-ROM is deselected (SPI_CSB = 1), the SPI_MISO line does not float. Instead,
BlueCore4-ROM outputs 0 if the processor is running or 1 if it is stopped.
CS-101564-DSP12
Writing to the Device
Reading from the Device
Multi-Slave Operation
Figure 9.15: SPI Read Operation
Figure 9.14: SPI Write Operation
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Device Terminal Descriptions
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