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(yè)數(shù)： 52/102頁(yè)
文件大小： 700K
代理商： MC68HC58FN
MC68HC58
DATA LINK CONTROLLER OPERATION
MOTOROLA
TECHNICAL DATA
4-9
Table 4-3 shows the types of serial transfers.
4.2.2.2 Servicing Sequence
For every byte transmitted from the host to the DLC, there is a byte transferred from
the DLC to the host. Each data byte sent to the DLC is accompanied by a status byte
that is sent to the host. Each command byte sent to the DLC is accompanied by a re-
ceived data byte that is sent to the host.
The host MCU services the DLC in the following sequence:
1. Read status byte and data byte.
2. Write data byte, configuration byte, or null byte and command byte.
Received data remains in the RxFIFO buffer until a flush byte command is received.
However, the flush command can accompany the read command. Each transmit data
byte must be accompanied by a command byte that designates it as a first, intermedi-
ate, or last byte.
4.2.2.3 SPI Exchange
The host MCU controls SCLK polarity and phase. The DLC is compatible with two
SCLK configurations:
SCLK polarity normally high, read data on SCLK passive to active level, change
data on SCLK active to passive level.
SCLK normally low, read data on SCLK passive to active level, change data on
SCLK active to passive level.
The general format of the data exchange from the DLC to the host MCU is a bit-for-bit
exchange on each SCLK clock pulse. Data is read in on the passive to active level of
the SCLK, and is changed on the active to passive level of SCLK. The most significant
bit of a transfer is sent first. Figure 4-6 shows a 16-bit data transfer with low clock po-
larity. Figure 4-7 shows a 16-bit data transfer with high clock polarity.
NOTE
This 16-bit transfer can be performed using two 8-bit transfers as
long as CS is asserted before the first 8-bit transfer begins, and re-
mains asserted until the end of the second 8-bit transfer.
Table 4-3 Serial Transfers
1st Byte
2nd Byte
Type of Transfer
—
SIMO
Command byte
SOMI
—
Status byte
SIMO
—
Transmit byte, configuration byte, or null byte
—
SOMI
Receive byte, completion code, or null byte
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