mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 535

• Manufacturer Part Number: mcf5282
• Manufacturer: Freescale Semiconductor, Inc

These functions are described here.
27.6.1
During reset, the pins for the reset override functions are immediately configured to known states.
Table 27-7
If the RCON pin is not asserted during reset, the chip configuration and the reset configuration pin
functions after reset are determined by the RCON register or fixed defaults, 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.
If the RCON pin is asserted during reset, then various chip functions, including the reset configuration pin
functions after reset, are configured according to the levels driven onto the external data pins. (See
Table
pins to allow for module configuration.
Freescale Semiconductor
A[23:0], BS[3:0], CS[3:0]
5. Clock mode selections
6. Chip select configuration
D[31:0], R/W, TA, TEA,
TSIZ[1:0], TS, TIP, OE,
27-8) The internal configuration signals are driven to reflect the levels on the external configuration
Pin(s) Affected
Reset Configuration
shows the states of the external pins while in reset.
1
2
D[26:24, 21, 19:16],
PA[2:0], PB[5, 3:0]
RCON
CLKMOD1, CLKMOD0
During reset, the CLKMOD pins always determine the clock mode,
regardless of the RCON pin state.
If the external RCON pin is not asserted during reset, pin functions are determined by the
default operation mode defined in the RCON register. If the external RCON pin is asserted, pin
functions are determined by the override values driven on the external data bus pins.
During reset, the external RCON pin assumes its RCON pin function, but this pin changes to
the function defined by the chip operation mode immediately after reset. See
Pin
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
Table 27-7. Reset Configuration Pin States During Reset
Configuration
RCON0 = 0
Table 27-8. Configuration During Reset
Default
Digital I/O or primary
function
RCON function for all
modes
Not affected
Function
2
Pin
NOTE
Override Pins
in Reset
D[26,17:16]
100 or 0xx
1
111
110
2,34
Input
Input
Input
I/O
Output
State
—
—
—
1
Must be driven
by external logic
Internal weak
pull-up device
Must be driven by
external logic
Chip Mode Selected
Single-chip mode
Chip Configuration Module (CCM)
Table
Master mode
Input
State
Function
Reserved
27-8.
5
27-7