K20P81M72SF1 Datasheet, PDF (31/74 Pages) Freescale Semiconductor, Inc – K20 Sub-Family

6.3.3.2
Peripheral operating requirements and behaviors
32kHz oscillator frequency specifications
Table 17. 32kHz oscillator frequency specifications
Symbol
f_{osc_lo}
t_start
Description
Oscillator crystal
Crystal start-up time
Min.
—
—
Typ.
32.768
1000
Max.
—
—
Unit
Notes
kHz
ms
1
1. Proper PC board layout procedures must be followed to achieve specifications.
6.4 Memories and memory interfaces
6.4.1 Flash electrical specifications
This section describes the electrical characteristics of the flash memory module.
6.4.1.1 Flash timing specifications — program and erase
The following specifications represent the amount of time the internal charge pumps are
active and do not include command overhead.
Table 18. NVM program/erase timing specifications
Symbol Description
t_hvpgm4 Longword Program high-voltage time
t_hversscr Sector Erase high-voltage time
t_hversblk32k Erase Block high-voltage time for 32 KB
t_hversblk256k Erase Block high-voltage time for 256 KB
Min.
—
—
—
—
Typ.
7.5
13
52
104
Max.
18
113
452
904
Unit
Notes
μs
ms
1
ms
1
ms
1
1. Maximum time based on expectations at cycling end-of-life.
6.4.1.2 Flash timing specifications — commands
Table 19. Flash command timing specifications
Symbol
t_rd1blk32k
t_rd1blk256k
Description
Read 1s Block execution time
• 32 KB data flash
• 256 KB program flash
Min.
—
—
Typ.
—
—
Max.
0.5
1.7
Unit
Notes
ms
ms
t_rd1sec1k Read 1s Section execution time (data flash
sector)
—
—
60
μs
1
t_rd1sec2k Read 1s Section execution time (program flash
—
—
60
μs
1
sector)
Table continues on the next page...
K20 Sub-Family Data Sheet, Rev. 2, 4/2012.
Freescale Semiconductor, Inc.
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