C8051F000-TB Silicon Laboratories Inc, C8051F000-TB Datasheet - Page 90
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C8051F000-TB
Manufacturer Part Number
C8051F000-TB
Description
BOARD PROTOTYPING W/C8051F000
Manufacturer
Silicon Laboratories Inc
Specifications of C8051F000-TB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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prohibited from reading locations in the lower partition using the MOVC instruction. (Executing a MOVC
instruction from the upper partition with a source address in the lower partition will always return a data value of
0x00.) Software running in the lower partition can access locations in both the upper and lower partition without
restriction.
The Value-added firmware should be placed in the lower partition. On reset, control is passed to the value-added
firmware via the reset vector. Once the value-added firmware completes its initial execution, it branches to a
predetermined location in the upper partition. If entry points are published, software running in the upper partition
may execute program code in the lower partition, but it cannot read the contents of the lower partition. Parameters
may be passed to the program code running in the lower partition either through the typical method of placing them
on the stack or in registers before the call or by placing them in prescribed memory locations in the upper partition.
The SRL address is specified using the contents of the Flash Access Register. The 16-bit SRL address is calculated
as 0xNN00, where NN is the contents of the SRL Security Register. Thus, the SRL can be located on 256-byte
boundaries anywhere in program memory space. However, the 512-byte erase sector size essentially requires that a
512 boundary be used. The contents of a non-initialized SRL security byte is 0x00, thereby setting the SRL address
to 0x0000 and allowing read access to all locations in program memory space by default.
Bits 7-0: FLACL: Flash Access Limit.
R/W
Bit7
Figure 11.3. FLACL: Flash Access Limit (C8051F005/06/07/15/16/17 only)
This register holds the high byte of the 16-bit program memory read/write/erase limit
address. The entire 16-bit access limit address value is calculated as 0xNN00 where NN is
replaced by contents of FLACL. A write to this register sets the Flash Access Limit. This
register can only be written once after any reset. Any subsequent writes are ignored
until the next reset.
R/W
Bit6
R/W
Bit5
R/W
Bit4
Rev. 1.7
R/W
Bit3
R/W
Bit2
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
R/W
Bit1
R/W
Bit0
SFR Address:
Reset Value
00000000
0xB7
90
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