ZAMC4100GA2R datasheet(57/156 Pages) RENESAS

57 / 156 page

ZAMC4100 Datasheet

January 26, 2016

If the data is successfully shifted into the SBC, the WRITE command is executed on the rising edge of CSN. This

allows the MCU to control precisely the moment when the data is written. For example, the drivers are enabled by

writing in their control register (see sections 3.8, 3.9, or 3.11) and in this case the CSN rising edge marks the

beginning of the motor operation.

3.7.3.

SPI Pipelined Write/Read Access

In order to provide bidirectional data transfer, the SBC SPI slave provides functionality for performing a register

data READ while the WRITE frame is transferred. This functionality is implemented as automatic indirect

addressing of the SBC registers using the SPIDPTR register (Table 3.50) as the data pointer.

the SBC receives the data WRITE byte. This feature allows pipelining of the ADC conversion and the data WRITE

(see section 3.12.7).

3.7.4.

SPI Read Access

To read data from SBC registers, the MCU sends a frame as shown in Figure 3.10–B.

1) Command byte (CMD) with the R/

W bit = 1, the 5-bit address of the register that is going to be read, and

the B bit with a value depending on the READ access type:

a. Single data read: B = 0

b. Burst data read: B = 1

2) Data byte: The MCU sends dummy data bits (keep as 0) while the SBC shifts out the contents of the

The SPI read access allows the MCU to read more than one data byte. The SBC shifts out data as long as the

CSN line is low and the SPI clock is running. If bit B = 0, the SBC shifts out all data from only one address, i.e.

continuous reading of a single address (Figure 3.11-A). If bit B = 1, the SBC shifts out multiple consecutive data

bytes and increments the address after sending each byte (Figure 3.11-B). In the case of a one-byte READ, the B

bit value is “don’t care.”

Figure 3.11 SPI Single or Burst Access

A) Single Address SPI READ

MISO

MOSI

SSB

CSN

RD DATA(Addr)

RD DATA (Addr)

B) Burst SPI READ

Address[4:0]

MISO

MOSI

SSB

CSN

RD DATA(Addr)

RD DATA (Addr+1)

Address[4:0]

ZAMC4100GA2R датащи(PDF) 57 Page - Renesas Technology Corp

ZAMC4100GA2R датащи(HTML) 57 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL