SPRS230M – OCTOBER 2003 – REVISED MARCH 2011
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3.2.8
L0, L1, H0 SARAMs
The F2809 and F2808 each contain an additional 16K x 16 of single-access RAM, divided into three
blocks (L0-4K, L1-4K, H0-8K). The F2806 contains an additional 8K x 16 of single-access RAM, divided
into two blocks (L0-4K, L1-4K). The F2802, F2801, C2802, and C2801 each contain an additional 4K x 16
of single-access RAM (L0-4K). Each block can be independently accessed to minimize CPU pipeline
stalls. Each block is mapped to both program and data space.
3.2.9
Boot ROM
The Boot ROM is factory-programmed with boot-loading software. Boot-mode signals are provided to tell
the bootloader software what boot mode to use on power up. The user can select to boot normally or to
download new software from an external connection or to select boot software that is programmed in the
internal Flash/ROM. The Boot ROM also contains standard tables, such as SIN/COS waveforms, for use
in math related algorithms.
Table 3-7. Boot Mode Selection
MODE
DESCRIPTION
Jump to Flash/ROM address 0x3F 7FF6
You must have programmed a branch instruction here prior
to reset to redirect code execution as desired.
Load a data stream from SCI-A
Load from an external serial SPI EEPROM on SPI-A
Load data from an external EEPROM at address 0x50 on
the I2C bus
Call CAN_Boot to load from eCAN-A mailbox 1.
Jump to M0 SARAM address 0x00 0000.
Jump to OTP address 0x3D 7800
Load data from GPIO0 - GPIO15
GPIO18
SPICLKA
SCITXDB
1
GPIO29
SCITXDA
1
GPIO34
1
Boot to Flash/ROM
SCI-A Boot
SPI-A Boot
I2C Boot
eCAN-A Boot
Boot to M0 SARAM
Boot to OTP
Parallel I/O Boot
1
1
1
0
0
0
0
1
0
0
1
1
0
0
0
1
0
1
0
1
0
36
Functional Overview
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