Command Definition - Freescale Semiconductor ColdFire MCF52210 ColdFire MCF52211 ColdFire MCF52212 ColdFire MCF52213 Reference Manual

EZPCK.The maximum frequency of the EzPort clock is half the system clock frequency for all commands
except when executing the read data command. When executing the Read Data command, the EzPort
clock has a maximum frequency of one eighth the system clock frequency.
19.3.2.2 EZPCS — EzPort Chip Select
EzPort chip select (EZPCS) is the chip select for signalling the start and end of serial transfers. If EZPCS
is asserted during and when the micro-controller's reset out signal is negated, then EzPort is enabled out
of reset; otherwise it is disabled. After EzPort is enabled, asserting EZPCS commences a serial data
transfer, which continues until EZPCS is negated again. The negation of EZPCS indicates the current
command is finished and resets the EzPort state machine so that it is ready to receive the next command.
19.3.2.3 EZPD — EzPort Serial Data In
EzPort serial data in (EZPD) is the serial data in for data transfers. It is registered on the rising edge of
EZPCK. All commands, addresses, and data are shifted in most significant bit first. When EzPort is driving
output data on EZPQ, the data shifted in EZPD is ignored.
19.3.2.4 EZPQ — EzPort Serial Data Out
EzPort serial data out (EZPQ) is the serial data out for data transfers. It is driven on the falling edge of
EZPCK. It is tri-stated, unless EZPCS is asserted and the EzPort is driving data out. All data is shifted out
most significant bit first.
19.4

Command Definition

The EzPort receives commands from an external device and translates those commands into flash memory
accesses. Table 19-2 lists the supported commands.
Command Description
WREN
WRDI Write Disable
RDSR Read Status Register
WRCR Write Config Register
READ
FAST_READ Read Data at High Speed
PP Page Program
SE
BE
RESET
1
Lists the compatible commands on the ST Microelectronics Serial Flash Memory parts.
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
Table 19-2. EzPort Commands
Write Enable
Read Data
Sector Erase
Bulk Erase
Reset Chip
Address
Code
Bytes
0x06 0
0x04 0
0x05 0
0x01 0
0x03 3
0x0B 3
0x02 3
0xD8 3
0xC7 0
0xB9 0
Dummy Data Compatible
Bytes Bytes
Commands
0 0 WREN
0 0
0 1
0 1 WRSR
0 1+
1 1+ FAST_READ
0 4 to 256
0 0
0 0
0 0
EzPort
1
WRDI
RDSR
READ
PP
SE
BE
DP
19-3