Freescale Semiconductor MCF52277 Reference Manual page 166

Chip Configuration Module (CCM)
Pin
BOOTMOD[1:0]
FB_A[21:16]
9.4.1.1 Reset Configuration (BOOTMOD[1:0] = 00 or 01)
If the BOOTMOD pins are 00 or 01 during reset, the RCON register determines the chip configuration
after reset, regardless of the states of the external data pins. The internal configuration signals are driven
to levels specified by the RCON register's reset state for default module configuration.
9.4.1.2 Reset Configuration (BOOTMOD[1:0] = 10)
If the BOOTMOD pins are 10 during reset, the chip configuration after reset is determined according to
the levels driven onto the FB_A[21:16] pins. (See
driven to reflect the levels on the external configuration pins to allow for module configuration.
The logic levels for reset configuration on FB_A[21:16] must be actively
driven when BOOTMOD equals 10. The FB_A[23:22,15:0] pins must be
allowed to float or be pulled high.
Pin(s) Affected
(none)
FB_D[31:0]
All output pins
(none)
9-10
Table 9-10. Reset Configuration Pin States During Reset
Direction Pin Function
I BOOTMOD function for all modes
FlexBus address functions
I
(BOOTMO ≠ 10)
Reset configuration data functions
I
(BOOTMOD = 10)
Table 9-11. Parallel Configuration During Reset
Affected CCM Override Pins
Register Bit(s) in Reset
FB_A16
RCON[1]
0
1
FB_A17
RCON[3:2]
0
1
FB_A18
RCON[4]
0
1
FB_A19
RCON[5]
0
1
MCF52277 Reference Manual, Rev. 1
Must be driven by external logic
Must be driven by external logic
Table 9-11.) The internal configuration signals are
NOTE
2,3
Crystal oscillator mode
Oscillator bypass mode
8-bit (split bus) or 32-bit (unified bus)
16-bit split bus
Output Pad Drive Strength
Low Drive Strength
High Drive Strength
PLL mode
Limp mode
Input State
N/A
1
Function
Oscillator Mode
Boot Device
PLL Mode
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