Cypress Semiconductor Perform CY8C24x94 User Manual download pdf (Page 12)

12 PSoC® 1 ISSP Programming Specifications, Document No. 001-15239 Rev. *J

Programming Flow

3.2.2 Power Cycle Mode

To initiate communication with the target using power cycle mode, apply V

to the target as shown in Figure 3-6. The target

attempts to drive the SDATA line high. The programmer then waits and polls for a high-to-low transition on the SDATA line,

which is the signal from the target that V

has stabilized. Note that until V

stabilizes, the SDATA signal is noisy and a false

edge could be detected. As a result, the programmer must wait for the time specified by T

VDDwait

(Table 4-2 on page 19)

before beginning to wait and poll. The programmer also must not drive the SCLK signal until the T

VDDwait

time period has

passed.

After the SDATA transition is detected, the programmer must transmit the Initialize 1 vectors in T

acq

seconds (see Table 4-2 on

page 19).

Next, send Initialize 2 vectors and wait for a high-to-low transition on SDATA. Send the appropriate Initialize 3 vectors for the

level applied to the PSoC when it is programmed.

During the power cycle phase of the Initialize Target Procedure, V

must be the only pin asserted. XRES must be low. The

PSoC’s internal pull-down resistor achieves this if the pin is left floating externally.

Figure 3-6. Using Power Cycling to Initialize

3.2.3 Verify Silicon ID Procedure

The Verify Silicon ID Procedure (see Figure 3-7 on page 12)

returns the package-specific silicon ID value from the target.

This is used by the programmer to verify the package type of

the target.

Figure 3-7. Verify Silicon ID Procedure

TVDD wait

SDATA

SCLK

acq

Tssclk

TrsclkTfsclk

Fsclk

= V

POR

Begin Verify Silicon

Send ID Setup

Vectors

Wait and Poll for

SDATA going low

Read Back Silicon

ID Word

Correct Value?

End Verify Silicon

Programming Failed

Yes

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 27 28

Comments to this Manuals

No comments

Cypress Semiconductor Perform CY8C24x94 User Manual Page 12

Comments to this Manuals

Related products and manuals for Battery chargers Cypress Semiconductor Perform CY8C24x94