MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
16-8
Freescale Semiconductor
16.3.2.2.5
Reset Configuration Halfword Read
The BAM program checks for a valid reset configuration halfword (RCHW, see
) at the first
location in external memory, i.e address 0x2000_0000.
If the BAM program fails to find a valid RCHW, it assumes the external memory does not contain a user
application and switches to serial boot mode.
If the BAM program does find a valid RCHW, it configures data pins and CS0 port size according to the
RCHW[PS0] bit and the e200z6 core watchdog according to the RCHW[WTE] bit. The watchdog timeout
Table 16-6. External Bus Interface Configuration
Pins
Reset
Serial Boot
Mode
1
or Internal Boot
Mode
1
This column is for serial boot mode only when entered directly using the BOOTCFG signals (See note 2).
External Boot with no
Arbitration
2
(Single Master Mode)
2
If serial boot is entered indirectly from either external boot mode because a valid RCHW was not found, the EBI
remains configured according to these columns.
External Boot with External
Arbitration
(Multi Master Mode)
Function
Function
Function
PCR
Function
PCR
ADDR[8:31]
GPIO
GPIO
ADDR[8:31]
0x0440
ADDR[8:31]
0X0440
DATA[16:31]
GPIO
GPIO
GPIO
3
3
If the BAM reads a valid RCHW with the PS0 bit clear, data[16:31] are reconfigured from GPIO to data bus signals
by writing 0x0440 to the PCRs.
Default
Default
DATA[0:15]
GPIO
GPIO
DATA[0:15]
0X0440
DATA[0:15]
0X0440
BB
4
4
Signal enabled in the MPC5554.
GPIO
GPIO
GPIO
Default
BB
0X0443
BG
GPIO
GPIO
GPIO
Default
BG
0X0443
GPIO
GPIO
GPIO
Default
BR
0X0443
TSIZ[0:1]
GPIO
GPIO
GPIO
Default
GPIO
Default
TEA
GPIO
GPIO
GPIO
Default
GPIO
Default
CS0
GPIO
GPIO
CS0
0X0443
CS0
0X0443
WE0_BE0
GPIO
GPIO
WE0
0X0443
WE0_BE0
0X0443
OE
GPIO
GPIO
OE
0X0443
OE
0X0443
TS
GPIO
GPIO
TS
0X0443
TS
0X0443
TA
GPIO
GPIO
GPIO
Default
GPIO
Default
RD_WR
GPIO
GPIO
GPIO
Default
GPIO
Default
CS[1:3]
GPIO
GPIO
GPIO
Default
GPIO
Default
BDIP
GPIO
GPIO
GPIO
Default
GPIO
Default
WE[1:3]_
BE[1:3]
GPIO
GPIO
GPIO
Default
GPIO
Default
Summary of Contents for MPC5553
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