DA16200 datasheet(53/154 Pages) RENESAS

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DA16200

Ultra Low Power Wi-Fi SoC

Datasheet

Revision 3.6

04-Jan-2023

CFR0011-120-00

53 of 153

9.3

SPI Slave

The SPI slave interface is a half-duplex connection for an external host to control the DA16200. The

range of the SPI clock speed is based on the internal bus clock speed and can be calculated using:

spi clock = system clock/N

where N is an integer divider such as 1,2,3,4,5,6,...

The SPI slave supports both the Burst mode and Non-burst mode. In the Burst mode, SPI_CSB

remains active from the start to the end of communication. In the Non-burst mode, SPI_CSB remains

active at every eight bits.

SPI Signals

Address

Decoder

Command

Decoder

Data

Decoder

APB bus

Controller

Figure 26: SPI Slave Block Diagram

Communication protocols of the SPI slave interface use either 4-byte or 8-byte control signals.

Between the two available communication protocols, the CPU chooses one before initiating the

control.

Figure 27 and Figure 28 shows the 8-byte and 4-byte control types.

SPI_CSB

SPI_CLK

SPI_MOSI

A [ 31 : 24 ]

A [ 7 : 0 ]

A [ 15 : 8 ]

A [ 23 : 16 ]

C [ 7 : 0 ]

L [ 23 : 16 ]

L [ 15 : 8 ]

L [ 7 : 0 ]

D [ 7 : 0 ]

D [ 15 : 8 ]

D [ 23 : 16 ]

D [ 31 : 24 ]

Figure 27: 8-byte Control Type

SPI_CSB

SPI_CLK

SPI_MOSI

A [ 15 : 8 ]

L [ 7 : 0 ]

C [ 7 : 0 ]

A [ 7 : 0 ]

D [ 7 : 0 ]

D [ 15 : 8 ]

D [ 23 : 16 ]

D [ 31 : 24 ]

Figure 28: 4-byte Control Type

The 8-byte control type uses a 4-byte address, 1-byte control, and 3-byte length. The 4-byte address

displays the address of registers subject to internal access. The 1-byte control is for communication

control and 3-byte length shows the length of data subject to continuous access in bytes. Hence,

when the 8-byte control type is applied, the maximal length of data subject to continuous access is 16

MB.

The 4-byte control type uses a 2-byte address, 1-byte control, and 1-byte length. The 2-byte address

displays the address of registers subject to internal access. The 1-byte control is for communication

control and 1-byte length shows the length of data subject to continuous access in bytes. Since the

32-bit address map is used internally, the 2-byte address is not enough to express everything. Thus,

the upper 2-byte base address is designated, and then the lower 2-byte address is used.

Table 36 and Table 37 shows the meaning of each bit in the 1-byte control in the 8-byte control type

and the 4-byte control type, respectively.

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