mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 511

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

22.3.5
BAAR defines the address space for memory-referencing BDM commands. BAAR[R, SZ] are loaded
directly from the BDM command, while the lower five bits can be programmed from the external
Freescale Semiconductor
BFCDIV8
BFCDIV
29–24
Reset
Reset
Field
23–0
DRc: 0x03 (CSR3)
31
30
WDEBUG Instruction No operation during the core’s execution of a WDEBUG instruction
W
W
R
R
WRITE_DREG
READ_DREG
31
15
0
0
0
0
Method
Reserved, must be cleared.
BDM flash clock divide by 8.
0 Input to the flash clock divider is the bus clock
1 Input to the flash clock divider is the bus clock divided by 8
BDM flash clock divider. The BFCDIV8 and BFCDIV fields specify the frequency of the internal flash clock when
performing a mass erase operation initiated by setting XCSR[ERASE]. These fields must be loaded with the
appropriate values prior to the setting of XCSR[ERASE] to initiate a mass erase operation in the flash memory.
This field divides the bus clock (or the bus clock divided by 8 if BFCDIV8 is set) by the value defined by the
BFCDIV plus one. The resulting frequency of the internal flash clock must fall within the range of 150–200 kHz for
proper flash operations. Program/erase timing pulses are one cycle of this internal flash clock, which corresponds
to a range of 5–6.7 μs. The automated programming logic uses an integer number of these pulses to complete
an erase or program operation.
where f
Reserved for future use by the debug module, must be cleared.
BDM Address Attribute Register (BAAR)
DIV8
BFC
30
14
0
0
0
if BFCDIV8 = 0, then f
if BFCDIV8 = 1, then f
FCLK
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
is the frequency of the flash clock and f
29
13
0
0
0
Reads CSR3[31
Writes CSR3[23
Figure 22-7. Configuration/Status Register 3 (CSR3)
Table 22-10. CSR3 Reference Summary (continued)
28
12
0
0
0
Table 22-11. CSR3 Field Descriptions
27
11
0
0
0
BFCDIV
FCLK
FCLK
–
–
= f
= f
0] from the BDM interface. Classified as a non-intrusive BDM command.
0] from the BDM interface. Classified as a non-intrusive BDM command.
26
10
0
0
0
Bus
Bus
÷ (BFCDIV + 1)
÷ (8 × (BFCDIV + 1)
25
0
9
0
0
24
Description
0
8
0
0
Reference Details
Bus
is the frequency of the bus clock.
23
0
0
0
0
7
22
0
0
0
0
6
21
0
0
0
0
5
Version 1 ColdFire Debug (CF1_DEBUG)
20
0
0
0
0
4
Access: Supervisor write-only
19
0
0
0
0
3
18
0
0
0
0
2
BDM read/write
17
0
0
0
0
1
22-19
16
0
0
0
0
0