MC9S12HZ256 Datasheet, PDF (637/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

The setup time can be ignored for this operation.
Appendix A Electrical Characteristics
A.3.1.4 Mass Erase
Erasing a NVM block takes:
t_mass ≈
The setup
20000
time can
⋅_bef--N--_i-_g-_V--_n--1_Mo---_r--_eO--_d--_P--_for
this
operation.
A.3.1.5 Blank Check
The time it takes to perform a blank check on the Flash or EEPROM is dependant on the location of the
first non-blank word starting at relative address zero. It takes one bus cycle per word to verify plus a setup
of the command.
t_check ≈ location ⋅ t_cyc + 10 ⋅ t_cyc
Table A-11. NVM Timing Characteristics
Conditions are shown in Table A-4 unless otherwise noted
Num C
Rating
Symbol
Min
Typ
Max
Unit
1 D External Oscillator Clock
f_NVMOSC
0.5
50 ¹
MHz
2 D Bus frequency for Programming or Erase Operations f_NVMBUS
1
MHz
3 D Operating Frequency
f_NVMOP
150
200
kHz
4 P Single Word Programming Time
t_swpgm
46 ²
74.5 ³
µs
5 D Flash Burst Programming consecutive word ⁴
t_bwpgm
20.4 ²
31 ³
µs
6 D Flash Burst Programming Time for 32 Words ⁴
t_brpgm
678.4 ²
1035.5 ³
µs
7 P Sector Erase Time
t_era
20 ⁵
26.7 ³
ms
8 P Mass Erase Time
t_mass
100 ⁵
133 ³
ms
9 D Blank Check Time Flash per block
t_check
11 ⁶
32778 ⁷
t_cyc
10 D Blank Check Time EEPROM per block
t_check
11 ⁶
2058⁷
t_cyc
1 _{Restrictions for oscillator in crystal mode apply!}
2 _{Minimum Programming times are achieved under maximum NVM operating frequency fNVMOP and maximum bus frequency}
f_bus.
3 _{Maximum Erase and Programming times are achieved under particular combinations of fNVMOP and bus frequency fbus. Refer}
to formulae in Sections Section A.3.1.1, “Single Word Programming,” through Section A.3.1.4, “Mass Erase,” for guidance.
4 _{urst Programming operations are not applicable to EEPROM}
5 _{Minimum Erase times are achieved under maximum NVM operating frequency fNVMOP.}
6 _{Minimum time, if first word in the array is not blank}
7 _{Maximum time to complete check on an erased block}
MC9S12HZ256 Data Sheet, Rev. 2.04
Freescale Semiconductor
637