MC9S12KG128 Datasheet, PDF (483/600 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 16 Debug Module (DBGV1)
16.3.2.5 Debug Comparator C Extended Register (DBGCCX)
7
6
5
4
3
2
1
0
R
PAGSEL
W
EXTCMP
Reset
0
0
0
0
0
0
0
0
Figure 16-9. Debug Comparator C Extended Register (DBGCCX)
Table 16-10. DBGCCX Field Descriptions
Field
7:6
PAGSEL
5:0
EXTCMP
Description
Page Selector Field — In both BKP and DBG mode, PAGSEL selects the type of paging as shown in
Table 16-11.
DPAGE and EPAGE are not yet implemented so the value in bit 7 will be ignored (i.e., PAGSEL values of 10 and
11 will be interpreted as values of 00 and 01, respectively).
Comparator C Extended Compare Bits — The EXTCMP bits are used as comparison address bits as shown
in Table 16-11 along with the appropriate PPAGE, DPAGE, or EPAGE signal from the core.
Note: Comparator C can be used when the DBG module is configured for BKP mode. Extended addressing
comparisons for comparator C use PAGSEL and will operate differently to the way that comparator A and
B operate in BKP mode.
Table 16-11. PAGSEL Decoding¹
PAGSEL
Description
EXTCMP
Comment
00
Normal (64k)
Not used
No paged memory
01
PPAGE
EXTCMP[5:0] is compared to
PPAGE[7:0] / XAB[21:14] becomes
(256 — 16K pages)
address bits [21:16]²
address bits [21:14]¹
10³
DPAGE (reserved)
EXTCMP[3:0] is compared to DPAGE / XAB[21:14] becomes address
(256 — 4K pages)
address bits [19:16]
bits [19:12]
11²
EPAGE (reserved)
EXTCMP[1:0] is compared to EPAGE / XAB[21:14] becomes address
(256 — 1K pages)
address bits [17:16]
bits [17:10]
1 _{See Figure 16-10.}
2 _{Current HCS12 implementations have PPAGE limited to 6 bits. Therefore, EXTCMP[5:4] should be set to 00.}
3 _{Data page (DPAGE) and Extra page (EPAGE) are reserved for implementation on devices that support paged data and extra}
space.
MC9S12KG128 Data Sheet, Rev. 1.15
Freescale Semiconductor
483