MC9S12NE64V1 Datasheet, PDF (487/554 Pages) Freescale Semiconductor, Inc – MC9S12NE64V1 Data Sheet

Memory Map and Register Definition
18.3.2.9 Debug Comparator A Extended Register (DBGCAX)
7
6
5
4
3
2
1
0
R
PAGSEL
W
EXTCMP
Reset
0
0
0
0
0
0
0
0
Figure 18-15. Debug Comparator A Extended Register (DBGCAX)
Table 18-19. DBGCAX Field Descriptions
Field
Description
7:6
PAGSEL
5:0
EXTCMP
Page Selector Field — If DBGEN is set in DBGC1, then PAGSEL selects the type of paging as shown in
Table 18-20.
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).
In BKP mode, PAGSEL has no meaning and EXTCMP[5:0] are compared to address bits [19:14] if the address
is in the FLASH/ROM memory space.
Comparator A Extended Compare Bits — The EXTCMP bits are used as comparison address bits as shown
in Table 18-20 along with the appropriate PPAGE, DPAGE, or EPAGE signal from the core.
Table 18-20. Comparator A or B Compares
Mode
EXTCMP Compare
High-Byte Compare
BKP¹
Not FLASH/ROM access
No compare
DBGCxH[7:0] = AB[15:8]
DBG²
FLASH/ROM access
PAGSEL = 00
EXTCMP[5:0] = XAB[19:14]
No compare
DBGCxH[5:0] = AB[13:8]
DBGCxH[7:0] = AB[15:8]
PAGSEL = 01
EXTCMP[5:0] = XAB[21:16]
DBGCxH[7:0] = XAB[15:14], AB[13:8]
1 _{See Figure 18-16.}
2 _{See Figure 18-10 (note that while this figure provides extended comparisons for comparator C, the figure also pertains to}
comparators A and B in DBG mode only).
PAGSEL
EXTCMP
DBGCXX 0
0
5
4
3
2
1
BIT 0
SEE NOTE 1
PORTK/XAB XAB21 XAB20 XAB19 XAB18 XAB17 XAB16 XAB15 XAB14
PPAGE PIX7 PIX6 PIX5 PIX4 PIX3 PIX2 PIX1 PIX0
SEE NOTE 2
NOTES:
1. In BKP mode, PAGSEL has no functionality. Therefore, set PAGSEL to 00 (reset state).
2. Current HCS12 implementations are limited to six PPAGE bits, PIX[5:0].
Figure 18-16. Comparators A and B Extended Comparison in BKP Mode
MC9S12NE64 Data Sheet, Rev. 1.1
Freescale Semiconductor
487