Cypress Semiconductor Perform CY8C24x94 User Manual download pdf (Page 11)

PSoC® 1 ISSP Programming Specifications, Document No. 001-15239 Rev. *J 11

Programming Flow

Figure 3-4. Initialize Target Procedure

3.2.1 Reset Mode

The timing to enter programming mode with Reset is shown

in Figure 3-5. To initialize the part using the XRES line, first

wait until V

is stable, and then assert the XRES line for

the time specified by T

xres

(see Table 4-2 on page 19). After

XRES is driven low, there is a window of time specified by

xresini

, as shown in Table 4-2 on page 19, in which the first

nine bits of the Initialize 1 vector-set must be transmitted.

When the target executes the operation, it drives the SDATA

line high. The programmer must wait and poll the SDATA

line for a high-to-low transition, which is the signal from the

target that the Initialize 1 operation has completed.

Next, send Initialize 2 vectors, wait for a high-to-low

transition on SDATA, and then send Initialize 3 vectors.

The programmer must sense the system supply and decide

which Initialize 3 vectors to supply. If V

 3.6 V, use one

set; if V

> 3.6 V, use the other. (Appendix A on page 21).

Figure 3-5. Using Reset to Initialize

Wait and Poll for

SDATA going low

Toggle XRES on

Device

Send

Initialize 1 Vector

Begin Initialize

Target

End Initalize Target

Power cycle

Reset mode?

Assert V

Wait for

TVDDwait

Wait and Poll for

SDATA going low

Assert V

Reset

Power cycle

Send

Initialize 2 Vectors

Wait and Poll for

SDATA going low

Send

Initialize 3 Vectors

Txres Txresini

XRES

SDATA

SCLK

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 27 28

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