Information
Table 16. 32kHz oscillator DC electrical specifications (continued)
Symbol Description Min. Typ. Max. Unit
C
para
Parasitical capacitance of EXTAL32 and XTAL32 — 5 7 pF
V
pp
1
Peak-to-peak amplitude of oscillation — 0.6 — V
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. Max. Unit Notes
f
osc_lo
Oscillator crystal — 32.768 — kHz
t
start
Crystal start-up time — 1000 — ms 1
f
ec_extal32
Externally provided input clock frequency — 32.768 — kHz 2
v
ec_extal32
Externally provided input clock amplitude 700 —
V
BAT
mV 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 V
IH
and V
IL
specifications do not apply. The voltage of the applied
clock must be within the range of V
SS
to V
BAT
.
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 Min. Typ. Max. Unit Notes
t
hvpgm4
Longword Program high-voltage time — 7.5 18 μs
t
hversscr
Sector Erase high-voltage time — 13 113 ms 1
t
hversblk32k
Erase Block high-voltage time for 32 KB — 52 452 ms 1
t
hversblk128k
Erase Block high-voltage time for 128 KB — 52 452 ms 1
1. Maximum time based on expectations at cycling end-of-life.
Peripheral operating requirements and behaviors
K20 Sub-Family Data Sheet, Rev. 4 5/2012.
30 Freescale Semiconductor, Inc.