ROHS MC9S08QE128 Reference Manual page 330

Chapter 18 Debug Module (DBG) (128K)
18.3.3.9 Debug Comparator A Extension Register (DBGCAX)
Module Base + 0x0008
7
R
RWAEN
W
POR
or non- 0
end-run
Reset
U
1
end-run
= Unimplemented or Reserved
Figure 18-10. Debug Comparator A Extension Register (DBGCAX)
1
In the case of an end-trace to reset where DBGEN=1 and BEGIN=0, the bits in this register do not change after reset.
Field
7 Read/Write Comparator A Enable Bit — The RWAEN bit controls whether read or write comparison is enabled
RWAEN for Comparator A.
0 Read/Write is not used in comparison
1 Read/Write is used in comparison
6 Read/Write Comparator A Value Bit — The RWA bit controls whether read or write is used in compare for
RWA Comparator A. The RWA bit is not used if RWAEN = 0.
0 Write cycle will be matched
1 Read cycle will be matched
5 Comparator A Page Select Bit — This PAGSEL bit controls whether Comparator A will be qualified with the
PAGSEL internal signal (mmu_ppage_sel) that indicates an extended access through the PPAGE mechanism. When
mmu_ppage_sel = 1, the 17-bit core address is a paged program access, and the 17-bit core address is made
up of PPAGE[2:0]:addr[13:0]. When mmu_ppage_sel = 0, the 17-bit core address is either a 16-bit CPU address
with a leading 0 in bit 16, or a 17-bit linear address pointer value.
0 Match qualified by mmu_ppage_sel = 0 so address bits [16:0] correspond to a 17-bit CPU address with a
leading zero at bit 16, or a 17-bit linear address pointer address
1 Match qualified by mmu_ppage_sel = 1 so address bits [16:0] compare to flash memory address made up of
PPAGE[2:0]:addr[13:0]
0 Comparator A Extended Address Bit 16 Compare Bit — The Comparator A bit 16 compare bit controls
Bit 16 whether Comparator A will compare the core address bus bit 16 to a logic 1 or logic 0.
0 Compare corresponding address bit to a logic 0
1 Compare corresponding address bit to a logic 1
330
6 5
RWA PAGSEL
0 0
U U
Table 18-11. DBGCAX Field Descriptions
MC9S08QE128 MCU Series Reference Manual, Rev. 2
4 3
0 0
0 0
0 0
Description
2 1
0 0
0 0
0 0
Freescale Semiconductor
0
Bit 16
0
U