56F802 datasheet(19/40 Pages) FREESCALE

tên linh kiện	56F802

Giải thích chi tiết về linh kiện	16-bit Digital Signal Controllers

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Flash Memory Characteristics

56F802 Technical Data, Rev. 7

Freescale Semiconductor

Figure 3-3 shows the definitions of the following signal states:

•

Active state, when a bus or signal is driven, and enters a low impedance state

•

Tri-stated, when a bus or signal is placed in a high impedance state

•

Data Valid state, when a signal level has reached VOL or VOH

•

Data Invalid state, when a signal level is in transition between VOL and VOH

Figure 3-3 Signal States

3.4 Flash Memory Characteristics

Table 3-5 Flash Memory Truth Table

Mode

XE1

1. X address enable, all rows are disabled when XE = 0

YE2

2. Y address enable, YMUX is disabled when YE = 0

SE3

3. Sense amplifier enable

OE4

4. Output enable, tri-state Flash data out bus when OE = 0

PROG5

5. Defines program cycle

ERASE6

6. Defines erase cycle

MAS17

7. Defines mass erase cycle, erase whole block

NVSTR8

8. Defines non-volatile store cycle

Standby

Read

Word Program

Page Erase

Mass Erase

Data Invalid State

Data1

Data2 Valid

Data

Tri-stated

Data3 Valid

Data2

Data3

Data1 Valid

Data Active

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