tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 591

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Flash Memory Operation
User Boot Mode
(1-A) Method 1: Storing a Programming Routine in the Flash Memory
(1) Determine the conditions (e.g., pin states) required for the flash memory to enter User Boot mode
(2) After
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and the I/O bus to be used to transfer new program code. Create hardware and software
accordingly. Before installing the TMP19A44F on a printed circuit board, write the following
program routines into an arbitrary flash block using programming equipment.
memory in User Boot mode. If mode switching conditions are met, the flash memory enters User
Boot mode. (All interrupts including NMI must be globally disabled while in User Boot mode.)
Mode judgment routine: Code to determine whether or not to switch to User Boot mode
Programming routine:
Copy routine:
RESET
(a) Mode Judgment Routine
(b) Programming Routine
(c) Copy Routine
(a) Mode Judgment Routine
(b) Programming Routine
(c) Copy Routine
TMP19A44F
Flash Memory
Flash Memory
[Reset Procedure]
TMP19A44F
[Reset Procedure]
Old Application
Old Application
Program Code
Program Code
is released, the reset procedure determines whether to put the TMP19A44F flash
TMP19A44 (rev1.3)24-6
Code to copy the flash programming routine from the TMP19A44F
Code to download new program code from a host controller and re-
program the flash memory
flash memory to either the TMP19A44F on-chip RAM or external
memory device.
Host Controller
Host Controller
I/O
I/O
RAM
RAM
New Application
New Application
Program Code
Program Code
0 → 1 RESET
Conditions for
entering User Boot
mode (defined by
the user)
TMP19A44
2010-04-01