ROM
7.5.8
CI_RESET
The Reset command configures FOPT[BF] to control flash/ROM Command Interpreter boot options and
initiates a reset by writing RCSR[SW] = 1. Because a hardware reset results from this operation, the
RESET command has no response packet unless an error is encountered. In cases of an error, the
“standard,” two-mailbox response packet is generated.
7.5.8.1
CI_RESET command-packet format
The command packet requires two mailboxes.
The five-bit command code for the reset command is 0x05.
Table 7-30. CI_RESET Command-packet format at mailbox level
Mailbox #
0
1
Description
Command byte
RESERVED
Bit 7
0
0
Bit 6
0
0
Bit 5
1
0
Bit 4
0
0
Bit 3
1
0
Bit 2
DR
0
Bit 1
0
0
Bit 0
FL
0
2 - 31
NOT USED
NOT USED
Table 7-31. Reset command: field descriptions
Field
DR
FL
Description
DRIVE
0 Set RCSR[DR] = 0 – RESETB pin is input only.
1 Set RCSR[DR] = 1 – RESETB pin is driven low on device reset.
Boot to Flash
0 Do not boot to flash.
1 Boot to flash.
The FL bit determines at what address the device boots on reset.
Table 7-32. Reset boot options
FL
0
1
Memory
ROM
Flash
Base Address
0x(00) 30_0000
0x(00) 00_0000
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
97
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