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30.4 Signal Descriptions
Table 30-1 provides an overview of the CCM signals.
RCON
CLKMOD[1:0]
D[26:24, 21, 19:16]
30.4.1 RCON
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 Section 30.6, "Functional Description"). The internal
configuration signals are driven to reflect the levels on the external configuration pins to
allow for module configuration.
30.4.2 CLKMOD[1:0]
The state of the CLKMOD[1:0] pins during reset determines the clock mode after reset.
30.4.3 D[26:24, 21, 19:16] (Reset Configuration Override)
If the external RCON pin is asserted during reset, then the states of these data pins during
reset determine the chip mode of operation, boot device, clock mode, and certain module
configurations after reset.
30.5 Memory Map and Registers
This subsection provides a description of the memory map and registers.
30.5.1 Programming Model
The CCM programming model consists of these registers:
• The chip configuration register (CCR) controls the main chip configuration.
• The reset configuration register (RCON) indicates the default chip configuration.
• The chip identification register (CIR) contains a unique part number.
MOTOROLA
Table 30-1. Signal Properties
Name
Reset configuration select
Clock mode select
Reset configuration override pins
Chapter 30. Chip Configuration Module (CCM)
Function
Internal weak
pull-up device
Signal Descriptions
Reset State
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30-3
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