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| 型號(hào)： | CR16HCS9VJE8Y |
| 英文描述： | Microcontroller |
| 中文描述： | 微控制器 |
| 文件頁(yè)數(shù)： | 65/157頁(yè) |
| 文件大?。?/td> | 1256K |
| 代理商： | CR16HCS9VJE8Y |
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65
www.national.com
17.0
MICROWIRE/SPI
MICROWIRE/PLUS is a synchronous serial communications
protocol, originally implemented in National Semiconductor's
COPS and HPC families of microcontrollers to minimize
the number of connections, and therefore the cost, of com-
municating with peripherals.
The device has an enhanced MICROWIRE/SPI interface
module (MWSPI) that can communicate with all peripherals
that conform to MICROWIRE or Serial Peripheral Interface
(SPI) specifications. This enhanced MICROWIRE interface
is capable of operating as either a master or slave and in 8-
or 16-bit mode. Figure 24 shows a typical enhanced MI-
CROWIRE interface application.
The enhanced MICROWIRE interface module includes the
following features:
— Programmable operation as a Master or Slave
— Programmable shift-clock frequency (master only)
— Programmable 8- or 16-bit mode of operation
— 8- or 16-bit serial I/O data shift register
— Two modes of clocking data
— Serial clock can be low or high when idle
— 16-bit read buffer
— Busy flag, Read Buffer Full flag, and Overrun flag for
polling and as interrupt sources
— Supports multiple masters
— Maximum bit rate of 10M bits/second (master mode)
5M bits/second (slave mode) at 20MHz system clock
— Supports very low-end slaves with the Slave Ready
output
— Echo back enable/disable (Slave only)
17.1
The MICROWIRE interface allows several devices to be con-
nected on one three-wire system. At any given time, one of
these devices operates as the master while all other devices
operate as slaves.
The master device supplies the synchronous clock (MSK) for
the serial interface and initiates the data transfer. The slave
devices respond by sending (or receiving) the requested da-
ta. Each slave device uses the master’s clock for serially
shifting data out (or in), while the master shifts the data in (or
out).
The three-wire system includes: the serial data in signal
(MDIDO for master mode, MDODI for slave mode), the serial
MICROWIRE OPERATION
data out signal (MDODI for master mode, MDIDO for slave
mode) and the serial clock (MSK).
In slave mode, an optional fourth signal (MCS) may be used
to enable the slave transmit. At any given time, only one
slave can respond to the master. Each slave device has its
own chip select signal (MCS) for this purpose.
The MICROWIRE interface allows the device to operate ei-
ther as a master or slave transferring 8- or 16-bits of data.
This is configured via the MMNS bit.
Figure 25 shows a block diagram of the enhanced MICROW-
IRE serial interface in the device.
17.1.1
The MICROWIRE interface is a full duplex transmitter/receiv-
er. A 16-bit shifter, which can be split into a low and high byte,
is used for both transmitting and receiving. In 8-bit mode,
only the lower 8-bits are used to transfer data. The transmit-
ted data is shifted out through MDODI pin (master mode) or
MDIDO pin (slave mode), starting with the most significant
bit. At the same time, the received data is shifted in through
MDIDO pin (master mode) or MDODI pin (slave mode), also
starting with the most significant bit first.
The shift in and shift out are controlled by the MSK clock. In
each clock cycle of MSK, one bit of data is transmitted/re-
ceived. The 16-bit shifter is accessible via the MWDAT regis-
ter. Reading the MWDAT register returns the value in the
read buffer. Writing to the MWDAT register updates the 16-
bit shifter.
Shifting
17.1.2
The enhanced MICROWIRE interface implements a double
buffer on read. As illustrated in Figure 25, the double read
Reading
Figure 24.
MICROWIRE Interface
DO
5
Chip Select Lines
CS
CS
CS
CS
MDIDO
DO
MDIDO
MDODI
MSK
MDODI
MSK
DI
DI
DI
DI
Master
Slave
SK
SK
SK
SK
8-Bit
A/D
1K Bit
EEPROM
LCD
Display
driver
VF
Display
Driver
I/O
Lines
I/O
Lines
MCS
MCS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CR16HCT5 | |
| CR16HCT5VJE7Y | Microcontroller |
| CR16HCT5VJE8Y | Microcontroller |
| CR16HCT5VJE9Y | Microcontroller |
| CR16HCT9 | |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CR16HCS9VJE9 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of 16-bit CAN-enabled CompactRISC Microcontrollers |
| CR16HCS9VJI0 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of 16-bit CAN-enabled CompactRISC Microcontrollers |
| CR16HCS9VJI1 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of 16-bit CAN-enabled CompactRISC Microcontrollers |
| CR16HCS9VJI2 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of 16-bit CAN-enabled CompactRISC Microcontrollers |
| CR16HCS9VJI3 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of 16-bit CAN-enabled CompactRISC Microcontrollers |
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