HPC16004 datasheet(22/36 Pages) NSC

22 / 36 page

MICROWIREPLUS (Continued)

TLDD11372 22

FIGURE 24 MICROWIREPLUS

MICROWIREPLUS Operation

The HPC46064 can enter the MICROWIREPLUS mode as

the master or a slave A control bit in the IRCD register

determines whether the HPC46064 is the master or slave

The shift clock is generated when the HPC46064 is config-

ured as a master An externally generated shift clock on the

SK pin is used when the HPC46064 is configured as a slave

When the HPC46064 is a master the DIVBY register pro-

grams the frequency of the SK clock The DIVBY register

allows the SK clock frequency to be programmed in 14 se-

lectable binary steps or T3 underflow from 153 Hz to

125 MHz with CKI at 200 MHz

The contents of the SIO register may be accessed through

any of the memory access instructions Data waiting to be

transmitted in the SIO register is clocked out on the falling

edge of the SK clock Serial data on the SI pin is clocked in

on the rising edge of the SK clock

MICROWIREPLUS Application

Figure 25 illustrates a MICROWIREPLUS arrangement for

an automotive application The microcontroller-based sys-

tem could be used to interface to an instrument cluster and

various parts of the automobile The diagram shows two

HPC46064 microcontrollers interconnected to other MI-

CROWIRE peripherals HPC46064

1 is set up as the mas-

ter and initiates all data transfers HPC46064

2 is set up

as a slave answering to the master

The master microcontroller interfaces the operator with the

system and could also manage the instrument cluster in an

automotive application Information is visually presented to

the operator by means of an LCD display controlled by the

COP472 display driver The data to be displayed is sent

serially to the COP472 over the MICROWIREPLUS link

Data such as accumulated mileage could be stored and re-

trieved from the EEPROM COP494 The slave HPC46064

could be used as a fuel injection processor and generate

timing signals required to operate the fuel valves The mas-

ter processor could be used to periodically send updated

values to the slave via the MICROWIREPLUS link To

speed up the response chip select logic is implemented by

connecting an output from the master to the external inter-

rupt input on the slave

TLDD11372 23

FIGURE 25 MICROWIREPLUS Application

HPC16004 датащи(PDF) 22 Page - National Semiconductor (TI)

HPC16004 датащи(HTML) 22 Page - National Semiconductor (TI)

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

датащи скачать

ссылки URL