SW00ENB-ZCC Toshiba, SW00ENB-ZCC Datasheet - Page 405

• Manufacturer Part Number: SW00ENB-ZCC
• Description: MCU, MPU & DSP Development Tools CASEWORKS
• Manufacturer: Toshiba

Specifications of SW00ENB-ZCC

• Tool Type: Development Software Support
• Core Architecture: 870
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.5.13
Password
Following an echo-back of the command code, the boot program checks the contents of the 12-byte
password area (0x0000_03F4 to 0x_0000_03FF) within the flash memory. If all these address locations
contain the same bytes of data other than FFH, a password area error occurs. In this case, the boot
program returns an error acknowledge (11H) in response to the checksum byte (the 17th byte),
regardless of whether the password sequence sent from the controller is all FFHs.
stored in the flash memory. Table 3.12 shows how they are compared byte-by-byte. All of the 12 bytes
must match to pass the password check. Otherwise, a password error occurs, which causes the boot
program to return an error acknowledge in response to the checksum byte (the 17th byte).
The RAM Transfer command (10H) causes the boot program to perform a password check.
The password sequence received from the controller (5th to 16th bytes) is compared to the password
Figure 3.13 Serial Operation Mode Determination Flow
Are all bytes the same?
tCD
Password area error
Are all bytes equal to
UART Mode
tAB
Figure 3.14 Password Area Check Flow
Start
tAD
FFH?
Start
tCD?
No
Yes
tAC
TMP1940FDBF-47
Yes
No
Yes
Password area is normal.
I/O Interface Mode
TMP1940FDBF