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2010 Microchip Technology Inc.

DS70102K-page 35

dsPIC30F Flash Programming Specification

11.2.2

REGOUT SERIAL INSTRUCTION

EXECUTION

The REGOUT control code allows for data to be

extracted from the device in ICSP mode. It is used to

clock the contents of the VISI register out of the device

over the PGD pin. Once the REGOUT control code is

received, eight clock cycles are required to process the

command. During this time, the CPU is held idle. After

these eight cycles, an additional 16 cycles are required

to clock the data out (see Figure 11-3).

The REGOUT instruction is unique because the PGD

pin is an input when the control code is transmitted to

the device. However, once the control code is

processed, the PGD pin becomes an output as the VISI

shifted out, PGD becomes an input again as the state

machine holds the CPU idle until the next 4-bit control

code is shifted in.

Note:

Once the contents of VISI are shifted out,

the dsPIC DSC device maintains PGD

as an output until the first rising edge of

the next clock is received.

FIGURE 11-1:

PROGRAM ENTRY AFTER RESET

FIGURE 11-2:

SIX SERIAL EXECUTION

FIGURE 11-3:

REGOUT SERIAL EXECUTION

23 24

PGC

P4a

PGD

24-bit Instruction Fetch

Execute 24-bit Instruction,

Execute PC – 1,

Fetch SIX Control Code

Fetch Next Control Code

18 19 202122

LSB X

X MSB

PGD = Input

P1B

P1A

23 24

PGC

P4a

PGD

24-bit Instruction Fetch

Execute 24-bit Instruction,

Execute PC – 1,

Fetch SIX Control Code

Fetch Next Control Code

18 19 202122

LSB X

X MSB

PGD = Input

P1a

P1b

PGC

PGD

PGD = Input

Execute Previous Instruction,

CPU Held In Idle

Shift Out VISI Register <15:0>

PGD = Output

P4a

15 16

No Execution Takes Place,

Fetch Next Control Code

PGD = Input

MSb

LSb

...

Fetch REGOUT Control Code

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