MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 594

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

JTAG Test Access Port and OnCE
22.14.4.3 OnCE Status Register
Advance Information
594
Reset:
Reset:
Read:
Read:
Write:
Write:
The 16-bit OnCE Status Register (OSR) indicates the reason(s) that
debug mode was entered and the current operating mode of the CPU.
HDRO — Hardware Debug Request Occurrence Flag
DRO — Debug Request Occurrence Flag
MBO — Memory Breakpoint Occurrence Flag
HDRO is set when the processor enters debug mode as a result of a
hardware debug request from the IDR signal or the DE pin. This bit is
cleared on test logic reset or when debug mode is exited with the GO
and EX bits set.
DRO is set when the processor enters debug mode and the debug
request (DR) control bit in the OnCE Control Register is set. This bit
is cleared on test logic reset or when debug mode is exited with the
GO and EX bits set.
MBO is set when a memory breakpoint request has been issued to
the CPU via the BRKRQ input and the CPU enters debug mode. In
some situations involving breakpoint requests on instruction
prefetches, the CPU may discard the request along with the prefetch.
In this case, this bit may become set due to the CPU entering debug
mode for another reason. This bit is cleared on test logic reset or
when debug mode is exited with the GO and EX bits set.
Freescale Semiconductor, Inc.
For More Information On This Product,
Bit 15
MBO
Bit 7
0
0
JTAG Test Access Port and OnCE
Figure 22-11. OnCE Status Register (OSR)
Go to: www.freescale.com
= Unimplemented or reserved
SWO
14
0
6
0
TO
13
0
5
0
FRZO
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
12
0
4
0
SQB
11
0
3
0
SQA
10
0
2
0
HDRO
PM1
9
0
1
0
MOTOROLA
DRO
PM0
Bit 8
Bit 0
0
0