MMC2107 Datasheet, PDF (197/618 Pages) –

Freescale Semiconductor, Inc.
Non-Volatile Memory FLASH (CMFR)
Registers and Memory Map
EHV
HVS
RECOVERY
Recovery = 48 scaled clocks or 128 clocks
PULSE WIDTH
Figure 9-6. Pulse Status Timing
RECOVERY
The recovery time is the time that the CMFR requires to remove the
program or erase voltage from the array before switching to another
mode of operation. The recovery time is determined by the
SCLKR[2:0] field and the ERASE bit. If SCLKR is not 000, the
recovery time is 48 of the scaled clock periods. If SCLKR = 000 the
recovery time is 128 clocks.
Once reset is completed HVS indicates no program or erase pulse
(HVS = 0).
SCLKR[2:0] — System Clock Range Field
The read/write SCLKR[2:0] field selects the system clock range for
program/erase pulse timing.
NOTE:
The SCLKR[2:0] bits are not write protected by the SES bit. Unless the
PAWS[2] bit is set, writes to SCLKR[2:0] in software should not be
changed if SES = 1.
To control the pulse widths for program and erase operations, the CMFR
uses the system clock and the timing control in CMFRCTL. The total
pulse time is defined by:
pulse width = system clock period × R × 2^N × M
Where:
R = clock scaling (see Table 9-4)
N = 5 + CLKPE[1:0] + ( (ERASE) × 10)
M = 1 + CLKPM[6:0]
MMC2107 – Rev. 2.0
MOTOROLA
Non-Volatile Memory FLASH (CMFR)
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Technical Data
197