Peripheral operating requirements and behaviors
Table 16. 32kHz oscillator DC electrical specifications (continued)
Symbol
Description
Min.
Typ.
Max.
Unit
Cpara
Parasitical capacitance of EXTAL32 and XTAL32
—
5
7
pF
1
Peak-to-peak amplitude of oscillation
—
0.6
—
V
Vpp
1. When a crystal is being used with the 32 kHz oscillator, the EXTAL32 and XTAL32 pins should only be connected to
required oscillator components and must not be connected to any other devices.
6.3.3.2 32kHz oscillator frequency specifications
Table 17. 32kHz oscillator frequency specifications
Symbol Description
Min.
—
Typ.
32.768
1000
32.768
—
Max.
—
Unit
kHz
ms
Notes
fosc_lo
tstart
fec_extal32
vec_extal32
Oscillator crystal
Crystal start-up time
—
—
1
2
Externally provided input clock frequency
Externally provided input clock amplitude
—
—
kHz
mV
VBAT
700
2, 3
1. Proper PC board layout procedures must be followed to achieve specifications.
2. This specification is for an externally supplied clock driven to EXTAL32 and does not apply to any other clock input. The
oscillator remains enabled and XTAL32 must be left unconnected.
3. The parameter specified is a peak-to-peak value and VIH and VIL specifications do not apply. The voltage of the applied
clock must be within the range of VSS to VBAT
.
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
thvpgm4 Longword Program high-voltage time
thversscr Sector Erase high-voltage time
Min.
Typ.
Max.
Unit
Notes
—
7.5
18
μs
—
—
—
13
52
52
113
452
452
ms
ms
ms
1
1
1
thversblk32k Erase Block high-voltage time for 32 KB
thversblk128k Erase Block high-voltage time for 128 KB
1. Maximum time based on expectations at cycling end-of-life.
K20 Sub-Family Data Sheet, Rev. 4 5/2012.
30
Freescale Semiconductor, Inc.
FREESCALE [ Freescale ]
