56F826 Datasheet, PDF (25/56 Pages) Freescale Semiconductor, Inc – 16-bit Digital Signal Controllers

Flash Memory Characteristics
Data1 Valid
Data1
Data2 Valid
Data2
Data Invalid State
Data Active
Data
Tri-stated
Figure 3-5 Signal States
3.5 Flash Memory Characteristics
Data3 Valid
Data3
Data Active
Table 3-5 Flash Memory Truth Table
Mode
XE¹ YE² SE³ OE⁴
Standby
L
L
L
L
Read
H
H
H
H
Word Program
H
H
L
L
Page Erase
H
L
L
L
Mass Erase
H
L
L
L
1. X address enable, all rows are disabled when XE = 0
2. Y address enable, YMUX is disabled when YE = 0
3. Sense amplifier enable
4. Output enable, tri-state Flash data out bus when OE = 0
5. Defines program cycle
6. Defines erase cycle
7. Defines mass erase cycle, erase whole block
8. Defines non-volatile store cycle
PROG⁵
L
L
H
L
L
ERASE⁶
L
L
L
H
H
MAS1⁷
L
L
L
L
H
NVSTR⁸
L
L
H
H
H
Mode
Read
Word program
Page erase
Mass erase
Table 3-6 IFREN Truth Table
IFREN = 1
Read information block
Program information block
Erase information block
Erase both block
IFREN = 0
Read main memory block
Program main memory block
Erase main memory block
Erase main memory block
56F826 Technical Data, Rev. 14
Freescale Semiconductor
25