BMSKTOPASA900(DCE) Toshiba, BMSKTOPASA900(DCE) Datasheet - Page 71

• Manufacturer Part Number: BMSKTOPASA900(DCE)
• Description: KIT STARTER TMPA900 USB JTAG
• Manufacturer: Toshiba
• Series: TOPASr
• Type: MCUr

Specifications of BMSKTOPASA900(DCE)

• Contents: Evaluation Board, Cable(s), Software and Documentation
• For Use With/related Products: TMPA900CMXBG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.6
3.6.1
Boot ROM
TMPA900CM contains a boot ROM for loading a user program to the internal RAM.
The following loading methods are supported.
Priority
TMPA900CM has two operation modes: external memory mode and internal boot ROM
mode. Either mode is selected in accordance with the AM1 and AM0 pin status when
RESETn is asserted.
RESETn
Operation Modes
1
(1) External memory mode: After reset, the CPU fetches instructions from external
(2) Internal boot ROM mode: After reset, the CPU fetches instructions from the
Mode Setting Pins
AM1
such as a PC
0
1
1
0
USB host
Source
AM0
Table 3.6.2 Overview of boot operation
1
0
1
0
internal boot ROM and executes them. According to the program in
the internal boot ROM, a user program is transferred to the internal
RAM via USB communication and branches into the program in the
internal RAM.
This triggers the user program to boot.
Table 3.6.2 shows the overview of boot operation.
Table 3.6.1 Operation Modes
Start from the external bus memory (with 16-bit bus)
Start from the external bus memory (with 32-bit bus)
BOOT (start from the internal boot ROM)
TEST (setting prohibited)
TENTATIVE
TMPA900CM- 70
Loading
memory and executes them.
USB
I/F
Operation Mode
Destination
Internal RAM
internal 8 KB_RAM
Operation after
Branch into the
0x0000_0000
loading
TMPA900CM
2009-10-14