PD77210_15 Datasheet, PDF (31/76 Pages) Renesas Technology Corp – 16-BIT FIXED-POINT DIGITAL SIGNAL PROCESSOR

µPD77210, 77213
5.1.2 Host boot
The boot parameter and instruction code are obtained via the host interface and transferred to the instruction
RAM.
5.1.3 Serial boot
The boot parameter and instruction code are obtained via the serial interface and transferred to the instruction
RAM.
5.2 Reboot
The contents of the instruction RAM can be rewritten by calling the following reboot entries by the program.
Reboot Mode
Entry
Address
Memory X memory
0x1
reboot _{Y memory}
0x2
XY memories
0x3
External memory 0x4
Host reboot
0x5
Serial reboot
0x6
Parameter
Number of
Instruction
Steps
Transfer
Source Start
Address
Transfer
Destination
R7L
DP3
R6L
R7L
DP7
R6L
R7L
DP3, DP7
R6L
R7L
DP3
R6L
R7L
−
R6L
R7L
−
R6L
Transfer
Destination
Start
Address
DP2
DP6
DP2
DP2
DP2
DP2
Transfer
Destination
Page
(DPR)
R5L
R5L
R5L
R5L
R5L
R5L
5.2.1 Memory reboot
The instruction code stored into data memory is transferred to the instruction RAM. Depending on the data
memory from which the instruction code is to be transferred, X memory reboot (rebooting from the X data memory), Y
memory reboot (rebooting from the Y data memory), XY memory reboot (rebooting from the X and Y data memories),
or external memory reboot (rebooting from the external data memory space) may be performed.
Perform memory rebooting by setting the following parameters and calling the entry address by the corresponding
rebooting method.
• R7L: Number of instruction steps to be rebooted
• DP3: First address of X memory storing instruction code (to reboot from X, XY or external memories)
• DP7: First address of X memory storing instruction code (to reboot from Y or XY memories)
• R6L: Transfer source data page register (DPR) (Specify 0x00 in the case of the internal data RAM area.)
Index register (for external memory rebooting)
• DP2: Transfer destination address of the instruction to be rebooted (to reboot from X, XY or external memories)
• DP6: Transfer destination address of the instruction to be rebooted (to reboot from Y memories)
• R5L: Transfer destination page register (DPR) (Specify 0x80 in the case of the internal instruction RAM area.)
Data Sheet U15203EJ3V0DS
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