ZLF645 MAXIM [Maxim Integrated Products], ZLF645 Datasheet - Page 68

• Manufacturer Part Number: ZLF645
• Description: Flash MCUs with Learning Amplification
• Manufacturer: MAXIM [Maxim Integrated Products]

19-4572; Rev 0; 4/09
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for the command will default to the maximum memory size. The on-chip Flash 
Controller must be written to and unlocked for the programming operation to occur. 
If the Flash Controller is not unlocked, the data is discarded. Also, data is discarded for
writes to protected areas of the Flash’s main or information Page 3 areas based upon
the settings of the read/write protect option bits in
ICP
ICP
ICP
ICP
ICP
ICP
Read Flash Memory (0BH)
from the Flash’s main memory area or Information Area. This command is equivalent
to the CPU reading the memory through the LDC and LDCI instructions. Data can be
read 1 to ‘memsize’ bytes at a time where
64 KB) of the Flash memory for the product option chosen (The
bytes can be written by setting the size to 0). Depending on the settings of the read/write
protect option bits in User Option Byte 1 register, reads to protected areas of the Flash’s
main memory area will return
ICP
ICP
ICP
ICP
ICP
ICP
Read Flash Main Memory CRC (0EH)
command computes and returns the Cyclic Redundancy Check (CRC) of the Flash’s
Main Memory using the 16-bit CRC-CCITT polynomial. If the device is not in ICP
mode, this command returns
commands, there is a delay from issuing of the command until the ICP returns the data.
The ICP reads the Main Memory, calculates the CRC value, and returns the result. The
delay is a function of the Flash main memory size and is approximately equal to the
system clock period multiplied by the number of bytes in the Flash main memory.
ICP
ICP
ICP
Read ICP Autobaud Register (1BH)— The Read ICP Autobaud register command
reads the 12-bit ICP autobaud value set during autobaud detection.
ICP
ICP
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0AH
Flash Memory Address[15:8]
Flash Memory Address[7:0]
Size[15:8]
Size[7:0]
1-memsize data bytes
0BH
Flash Memory Address[15:8]
Flash Memory Address[7:0]
Size[15:8]
Size[7:0]
1-65536 data bytes
0EH
CRC[15:8]
CRC[7:0]
1BH
(4’b0000, Autobaud[11:8])
—The Read Flash Memory command is used to read data
FFFFH
FFH
for the data.
for the CRC value. Unlike most other ICP Read
—The Read Flash Main Memory CRC 
memsize
User Option Byte 1 (OPT1)
ICP In-Circuit Programming Commands
represents the size (32 KB or 
ZLF645 Series Flash MCUs
Product Specification
memsize
number of
register.
60