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參數(shù)資料
| 型號(hào)： | MC68HC58FN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 1 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 51/102頁 |
| 文件大?。?/td> | 700K |
| 代理商： | MC68HC58FN |
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MOTOROLA
DATA LINK CONTROLLER OPERATION
MC68HC58
4-8
TECHNICAL DATA
4.2.2 MC68HC58 DLC Serial Mode Host MCU Interface
In serial mode, the MC68HC58 DLC communicates with the host MCU via the SPI.
The SPI performs simultaneous bidirectional transfers initiated by an SPI bus master,
with the DLC functioning as an SPI slave device. SPI transfers are timed by the SCLK
signal from the host MCU. All Motorola MCU families (M68HC05, M68HC08,
M68HC11, M68HC12, M68HC16, M68300 and MPC500) have devices with SPI ca-
pabilities, but any host MCU that meets the clock specification can be used. Refer to
APPENDIX A ELECTRICAL CHARACTERISTICS for more information.
4.2.2.1 Serial Mode Data Transfer
Data is always transferred between the host MCU and the DLC in a two byte format,
with an optional delay between bytes for data management. This delay can be omitted
if the host is utilizing a 16-bit shift register. The CS signal must remain asserted
throughout the duration of the 16-bit transfer.
While the host MCU is transmitting a data byte to the DLC, the DLC is transmitting a
status byte to the host MCU. This status byte updates the host MCU as to the status
of the DLC and its FIFO buffers. The host MCU then transmits a command byte to the
DLC, which tells the DLC what to do with the preceding data byte, while the DLC trans-
mits a data byte to the host MCU. In the DLC, when the RFS field indicates that a com-
pletion code is at the head of the buffer, the accompanying data byte contains that
same completion code.
The command, status and data bytes are ordered MSB-to-LSB, and are transmitted in
the non-return to zero (NRZ) bit format. Figure 4-5 shows the DLC serial mode byte
format.
Figure 4-5 DLC Serial Mode Byte Format
T7
T6
T5
T4
T3
T2
T1
T0
C7
C6
C5
C4
C3
C2
C1
C0
TRANSMIT BYTE
COMMAND BYTE
SCLK
SIMO
OPTIONAL DELAY FOR
DATA MANAGEMENT
S7
S6
S5
S4
S3
S2
S1
S0
R7
R6
R5
R4
R3
R2
R1
R0
STATUS BYTE
RECEIVE BYTE
SOMI
DLC SERIAL MODE BYTE FORMAT
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