C28 Clock Semaphore Register; C28 Clock Semaphore Field Descriptions - Texas Instruments Concerto F28M35 Series Technical Reference Manual

System Control Registers
Table 1-182. C28 Flash Semaphore Field Descriptions (continued)
Bit Field
1-0 SEM

1.13.12.7 C28 Clock Semaphore Register

31
15
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Bit Field
31-4 KEY
3-2 Reserved
1-0 SEM
292
System Control and Interrupts
Value Description
0 Pump Access Request Semaphore from the C28
• A value of "00", "10", "11" gives ownership to the M3
• A value of "01" gives ownership to the C28.
• The following are the only state transitions allowed on these bits.
– "00","11" -> "01"
– "00","11" -> "10"
• "10" -> "00","11" (This can only happen from a C28x write to these bits to relinquish its
ownership)
• State transitions from "00" → "11" and "11" → "00" are allowed by design. However these
transitions will not result in change in ownership.
Figure 1-171. C28 Clock Semaphore Register
KEY
R=0/W
Table 1-183. C28 Clock Semaphore Field Descriptions
Value Description
0 Writing the value 0xE318C59 will allow writes to the SEM bits or writes are ignored. Reads will
return 0.
Note: This is to prevent spurious writes to the semaphore bits.
Reserved
0 Clock Control Access Request from the C28
• A value of "00", "10", "11" gives ownership to the M3
• A value of "01" gives ownership to the C28.
• The following are the only state transitions allowed on these bits.
– "00","11" -> "01"
– "00","11" -> "10"
• "10" -> "00","11" (This can only happen from a C28x write to these bits to relinquish its
ownership)
• State transitions from "00" → "11" and "11" → "00" are allowed by design. However these
transitions will not result in change in ownership.
Copyright © 2012–2019, Texas Instruments Incorporated
KEY
R=0/W
4
SPRUH22I – April 2012 – Revised November 2019
www.ti.com
3 2 1
Reserved SEM
R-0 R/W-0
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