Chip Configuration Register (Ccr); Register Descriptions; Ccr Field Descriptions - Motorola ColdFire MCF5281 User Manual

30.5.3 Register Descriptions

The following subsection describes the CCM registers.

30.5.3.1 Chip Configuration Register (CCR)

15 14
Field LOAD
Reset
R/W R/W
Address
Note: The reset value of the LOAD and MODE fields is determined during reset configuration. The SZEN is set for
master mode and cleared for all other configurations. The BME bit is set to enable the bus monitor and all other bits in
the register are cleared at reset.
Bits Name
15 LOAD Pad driver load. The LOAD bit selects full or partial drive strength for selected pad output drivers. For
maximum capacitive load, set the LOAD bit to select full drive strength. For reduced power consumption
and reduced electromagnetic interference (EMI), clear the LOAD bit to select partial drive strength.
0 Default drive strength.
1 Full drive strength.
Table 30-2 shows the read/write accessibility of this write-once bit.
14–11 — Reserved, should be cleared.
10–8 MODE Chip configuration mode. This read-only field reflects the chip configuration mode.
000-101 Reserved.
110 Single-chip mode.
111 Master mode.
7 — Reserved, should be cleared.
6 SZEN SIZ[1:0] enable. This read/write bit enables the SIZ[1:0] function of the external pins.
0 SIZ[1:0] function disabled.
1 SIZ[1:0] function enabled.
5 PSTEN PST[3:0]/DDATA[3:0] enable. This read/write bit enables the Processor Status (PST) and Debug Data
(DDATA)n functions of the external pins.
0 PST/DDATA function disabled.
1 PST/DDATA function enabled.
4 — Reserved, should be cleared.
MOTOROLA
11 10
— MODE
Read Only
IPSBAR + 0x11_0004
Figure 30-2. Chip Configuration Register (CCR)
Table 30-4. CCR Field Descriptions
Chapter 30. Chip Configuration Module (CCM)
8 7 6 5
— SZEN PSTEN
See Note
Description
Memory Map and Registers
4 3 2
— BME BMT
R/W
30-5
0