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Control Registers
515
SPNU563A–March 2018
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CPU Compare Module for Cortex-R5F (CCM-R5F)
13.3.9 CCM-R5F Key Register 4 (CCMKEYR4)
Figure 13-11. CCM-R5F Key Register 4 (CCMKEYR4) (Offset = 20h)
31 16
Reserved
R-0
15 4 3 0
Reserved MKEY4
R-0 R/WP-0
LEGEND: R/W = Read/Write; R = Read only; WP = Write in privileged mode only; -n = value after reset
Table 13-16. CCM-R5F Key Register 4 (CCMKEYR4) Field Descriptions
Bit Field Value Description
31-4 Reserved 0 Reads return 0. Writes have no effect.
3-0 MKEY4 Mode Key to select operation for Power Domain Inactivity Monitor.
Read in User and Privileged mode. Write in Privileged mode only.
0 Read: Returns current value of the MKEY4.
Write: Active Compare Lockstep mode.
6h Read: Returns current value of the MKEY4.
Write: Self-test mode.
9h Read: Returns current value of the MKEY4.
Write: Error Forcing mode.
Fh Read: Returns current value of the MKEY4.
Write: Self-test Error Forcing mode.
Other values Note: It is recommended to not write any other key combinations. Invalid keys will result in
switching operation to lockstep mode.
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