Reset Configuration Pin States During Reset; Configuration During Reset - Motorola ColdFire MCF5281 User Manual

Table 30-9. Reset Configuration Pin States During Reset
D[26:24, 21, 19:16],
PA[2:0], PB[5, 3:0]
RCON
CLKMOD1, CLKMOD0
1
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.
2
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 Table 30-10.
If the RCON pin is not asserted during reset, the chip configuration and the reset
configuration pin functions after reset are determined by RCON 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 30-10) The internal configuration signals are driven to
reflect the levels on the external configuration pins to allow for module configuration.
Pin(s) Affected
D[31:0], R/W, TA, TEA,
TSIZ[1:0], TS, TIP, OE, A[23:0],
BS[3:0], CS[3:0]
CS0
All output pins
MOTOROLA
Pin
Function
Digital I/O or primary
function
RCON function for all
2
modes
Not affected
Table 30-10. Configuration During Reset
Default
Configuration
RCON0 = 0
RCON[4:3] = 00
RCON2 = 0
RCON5 = 1
Chapter 30. Chip Configuration Module (CCM)
Pin Output
I/O
1
State
Input —
Input —
Input —
Override Pins
2, 3 4
in Reset
D[26,17:16]
111
110
100 or 0XX
D[19:18]
00
10
01
11
D21
0
1
Functional Description
Input
State
Must be driven
by external logic
Internal weak pull-up
device
Must be driven by
external logic
1
Function
Chip Mode Selected
Master mode
5
Single-chip mode
Reserved
Boot Device
5
Internal with 32-bit port
External with 8-bit port
External with 16-bit port
External with 32-bit port
Output Pad Drive Strength
Partial strength
5
Full strength
30-9