st20-gp1 STMicroelectronics, st20-gp1 Datasheet - Page 69

• Manufacturer Part Number: st20-gp1
• Description: Gps Processor
• Manufacturer: STMicroelectronics

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.
Bootstrap
Poke
Peek
reply
Control byte
where n is 2 to 255
0
1
n
Figure 11.1 Peek, poke and bootstrap
1
address
address
bootstrap
data
data
n
ST20-GP1
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