DSPIC30F1010-30I/SP【PDF 15/66 页】IC DSPIC MCU/DSP 6K 28DIP

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dsPIC30F Flash Programming Specification

DS70102K-page 22

2010 Microchip Technology Inc.

clocked out. The programmer can begin to clock out

the response 20

μsec after PGD is brought low, and it

must provide the necessary amount of clock pulses to

receive the entire response from the programming

executive.

Once the entire response is clocked out, the

programmer should terminate the clock on PGC until it

is time to send another command to the programming

executive. This protocol is illustrated in Figure 7-2.

7.3

SPI Rate

In Enhanced ICSP mode, the dsPIC30F operates from

the fast internal RC oscillator, which has a nominal

frequency of 7.37 MHz. This oscillator frequency yields

an effective system clock frequency of 1.84 MHz. Since

the SPI module operates in Slave mode, the

programmer must limit the SPI clock rate to a

frequency no greater than 1 MHz.

Note:

If the programmer provides the SPI with a

clock faster than 1 MHz, the behavior of

the programming executive will be

unpredictable.

7.4

Time Outs

The programming executive uses no Watchdog Timer

or time out for transmitting responses to the

programmer. If the programmer does not follow the flow

control mechanism using PGC, as described in

Section 7.2 “Communication Interface and Proto-

col”, it is possible that the programming executive will

behave unexpectedly while trying to send a response

to the programmer. Since the programming executive

has no time out, it is imperative that the programmer

correctly follow the described communication protocol.

As a safety measure, the programmer should use the

command time outs identified in Table 8-1. If the

command time out expires, the programmer should

reset

the

programming

executive

and

start

programming the device again.

FIGURE 7-2:

PROGRAMMING EXECUTIVE – PROGRAMMER COMMUNICATION PROTOCOL

15 16

PGC

PGD

PGC = Input

PGC = Input (Idle)

Host Transmits

Last Command Word

PGD = Input

PGD = Output

15 16

MSB X X X LSB

P9b

P10

PGC = Input

PGD = Output

P9a

Programming Executive

Processes Command

Host Clocks Out Response

P11

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