Motorola ColdFire MCF5281 - Manual (Page 532)

Chip Configuration Module (CCM)
27-4 Freescale Semiconductor
27.5.3 Register Descriptions
The following subsection describes the CCM registers.
27.5.3.1 Chip Configuration Register (CCR)
4
Accessing an unimplemented address has no effect and causes a cycle termination transfer error.
NOTE
To safeguard against unintentionally activating test logic, write 0x0000 to
the above reserved location during initialization (immediately after reset) to
lock out test features. Setting any bits in the CCR may lead to unpredictable
results.
15 14 11 10 8 7 6 5 4 3 2 0
Field LOAD — MODE — SZEN PSTEN — BME BMT
Reset See Note
R/W R/W Read Only R/W
Address IPSBAR + 0x11_0004
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.
Figure 27-2. Chip Configuration Register (CCR)
Table 27-4. CCR Field Descriptions
Bits Name Description
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 27-2 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.
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3