S9S12G240F0CLFR Freescale Semiconductor, S9S12G240F0CLFR Datasheet - Page 334
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S9S12G240F0CLFR
Manufacturer Part Number
S9S12G240F0CLFR
Description
16-bit Microcontrollers - MCU 16BIT 240KB FLASH
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S12G96F0CLL.pdf
(1292 pages)
Specifications of S9S12G240F0CLFR
Rohs
yes
Core
S12
Processor Series
MC9S12G
Data Bus Width
16 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
240 KB
Data Ram Size
4 KB
On-chip Adc
Yes
Operating Supply Voltage
3.13 V to 5.5 V
Operating Temperature Range
- 40 C to + 125 C
Package / Case
LQFP-48
Mounting Style
SMD/SMT
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
S9S12G240F0CLFR
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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S12S Debug Module (S12SDBGV2)
8.4.2.1.4
Comparator A features an NDB control bit, which allows data bus comparators to be configured to either
trigger on equivalence or trigger on difference. This allows monitoring of a difference in the contents of
an address location from an expected value.
When matching on an equivalence (NDB=0), each individual data bus bit position can be masked out by
clearing the corresponding mask bit (DBGADHM/DBGADLM) so that it is ignored in the comparison. A
match occurs when all data bus bits with corresponding mask bits set are equivalent. If all mask register
bits are clear, then a match is based on the address bus only, the data bus is ignored.
When matching on a difference, mask bits can be cleared to ignore bit positions. A match occurs when any
data bus bit with corresponding mask bit set is different. Clearing all mask bits, causes all bits to be ignored
and prevents a match because no difference can be detected. In this case address bus equivalence does not
cause a match.
8.4.2.2
Using the AB comparator pair for a range comparison, the data bus can also be used for qualification by
using the comparator A data registers. Furthermore the DBGACTL RW and RWE bits can be used to
qualify the range comparison on either a read or a write access. The corresponding DBGBCTL bits are
ignored. The SZE and SZ control bits are ignored in range mode. The comparator A TAG bit is used to tag
336
SZE
0
0
0
0
0
1
1
1
1
1
1
SZ
X
X
X
X
X
0
0
0
0
1
1
NDB
DBGADHM,
DBGADLM
Range Comparisons
0
0
1
1
Comparator A Data Bus Comparison NDB Dependency
$FF00
$00FF
$00FF
$FFFF
$FFFF
$00FF
$FF00
$FFFF
$FF00
$0000
$0000
DBGADHM[n] /
DBGADLM[n]
Byte, data(ADDR[n])=DH
Word, data(ADDR[n])=DH, data(ADDR[n+1])=X
Word, data(ADDR[n])=X, data(ADDR[n+1])=DL
Byte, data(ADDR[n])=X, data(ADDR[n+1])=DL
Word, data(ADDR[n])=DH, data(ADDR[n+1])=DL
Byte, data(ADDR[n])=DH, data(ADDR[n+1])=DL
Word
Word, data(ADDR[n])=X, data(ADDR[n+1])=DL
Word, data(ADDR[n])=DH, data(ADDR[n+1])=X
Word, data(ADDR[n])=DH, data(ADDR[n+1])=DL
Byte
Byte, data(ADDR[n])=DH
0
1
0
1
Table 8-35. NDB and MASK bit dependency
MC9S12G Family Reference Manual, Rev.1.23
DH=DBGADH, DL=DBGADL
Access
Compare data bus bit. Match on equivalence.
Compare data bus bit. Match on difference.
Do not compare data bus bit.
Do not compare data bus bit.
Comment
Match data( ADDR[n])
Match data( ADDR[n+1])
Possible unintended match
Match data( ADDR[n], ADDR[n+1])
Possible unintended match
No databus comparison
Match only data at ADDR[n+1]
Match only data at ADDR[n]
Match data at ADDR[n] & ADDR[n+1]
No databus comparison
Match data at ADDR[n]
Comment
Freescale Semiconductor
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