MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
Chip Configuration Module (CCM)
Functional Description
3.8.1 Reset Configuration
During reset, the pins for the reset override functions are immediately
configured to known states, even if the clock source is not present.
Table 3-6 shows the states of the external pins while in reset.
Table 3-6. Reset Configuration Pin States During Reset
Pin
Pin
Function (1)
I/O
Output
State
Input
State
nc...
Freescale Semiconductor, I
D[28, 26, 23:21, 19:16],
PA[4, 2], PB[7:5, 3:0]
RCON
Digital I/O or primary
function
RCON function for all
modes (2)
Input —
Input —
V DDSYN Not affected Input —
Must be driven
by external logic
Internal weak
pullup device
Must be driven by
external logic
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 chip operation mode defined 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 3-7.
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 external 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 3-7.) The internal configuration signals are driven to reflect
the levels on the external configuration pins to allow for module
configuration.
MMC2107 – Rev. 2.0
Technical Data
MOTOROLA Chip Configuration Module (CCM) 101
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