Table 4-13 Flash Parameters at 60-MHz SYSCLKOUT
PARAMETER |
TEST CONDITIONS |
MIN |
TYP |
MAX |
UNIT |
Program Time(3) |
8K Sector |
|
|
250 |
2000(2) |
ms |
4K Sector |
|
|
125 |
2000(2) |
ms |
16-Bit Word |
|
|
50 |
|
μs |
Erase Time(1) |
8K Sector |
|
|
2 |
12(2) |
s |
4K Sector |
|
|
2 |
12(2) |
IDDP(4) |
VDD current consumption during Erase/Program cycle |
VREG disabled |
|
80 |
|
mA |
IDDIOP(4) |
VDDIO current consumption during Erase/Program cycle |
|
60 |
|
mA |
IDDIOP(4) |
VDDIO current consumption during Erase/Program cycle |
VREG enabled |
|
120 |
|
mA |
(1) The on-chip flash memory is in an erased state when the device is shipped from TI. As such, erasing the flash memory is not required prior to programming, when programming the device for the first time. However, the erase operation is needed on all subsequent programming operations.
(2) Maximum flash parameter mentioned are for the first 100 program and erase cycles.
(3) Program time is at the maximum device frequency. The programming time indicated in this table is applicable only when all the required code/data is available in the device RAM, ready for programming. Program time includes overhead of the flash state machine but does not include the time to transfer the following into RAM:
- the code that uses flash API to program the flash
- the Flash API itself
- Flash data to be programmed
(4) Typical parameters as seen at room temperature including function call overhead, with all peripherals off. It is important to maintain a stable power supply during the entire flash programming process. It is conceivable that device current consumption during flash programming could be higher than normal operating conditions. The power supply used should ensure VMIN on the supply rails at all times, as specified in the Recommended Operating Conditions of the data sheet. Any brown-out or interruption to power during erasing/programming could potentially corrupt the password locations and lock the device permanently. Powering a target board (during flash programming) through the USB port is not recommended, as the port may be unable to respond to the power demands placed during the programming process.