ST20-GP1 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST20-GP1

GPS PROCESSOR

STMicroelectronics 

ST20-GP1

Control byte

Poke 0

address

data

Peek 1

address

reply

data

1

n

Bootstrap n

bootstrap

where n is 2 to 255

Figure 11.1 Peek, poke and bootstrap

Note, peeks and pokes in the address range #20000000 to #3FFFFFFF access the internal

peripheral device registers. Therefore they can be used to configure the EMI before booting. Note

that addresses that overlap the internal peripheral addresses (#20000000 to 3FFFFFFF) can not

be accessed via the link.

Following a peek or poke, the ST20-GP1 returns to its previously held state. Any number of

accesses may be made in this way until the control byte is greater than 1, when the ST20-GP1 will

commence reading its bootstrap program.

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