HD64336901G Renesas Technology, HD64336901G Datasheet - Page 133

• Manufacturer Part Number: HD64336901G
• Description: (HD64xxx Series) 16-BIT MICROCONTROLLER
• Manufacturer: Renesas Technology

Table 7.4
Table 7.5
Table 7.6
Note: Time shown in s.
7.4.2
When erasing flash memory, the erase/erase-verify flowchart shown in figure 7.4 should be
followed.
1. Prewriting (setting erase block data to all 0s) is not necessary.
2. Erasing is performed in block units. Make only a single-bit specification in the erase block
3. The time during which the E bit is set to 1 is the flash memory erase time.
4. The watchdog timer (WDT) is set to prevent overerasing due to program runaway, etc. An
5. For a dummy write to a verify address, write 1-byte data H'FF to an even address. Verify data
Program Data
0
0
1
1
Reprogram Data
0
0
1
1
n
(Number of Writes)
1 to 6
7 to 1,000
register (EBR1). To erase multiple blocks, each block must be erased in turn.
overflow cycle of approximately 19.8 ms is allowed.
can be read in words from the address to which a dummy write was performed.
Erase/Erase-Verify
Reprogram Data Computation Table
Additional-Program Data Computation Table
Programming Time
Verify Data
0
1
0
1
Verify Data
0
1
0
1
Programming
Time
30
200
Reprogram Data
1
0
1
1
Additional-Program
Data
0
1
1
1
In Additional
Programming
10
—
Rev. 1.00, 11/03, page 105 of 376
Comments
Programming completed
Reprogram bit
—
Remains in erased state
Comments
Additional-program bit
No additional programming
No additional programming
No additional programming
Comments