参数资料
型号: MC68HC912BL16FU8
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封装: QFP-64
文件页数: 27/128页
文件大小: 3326K
代理商: MC68HC912BL16FU8
MC68HC912BL16
122
MC68HC912BL16TS/D
The 16-bit SHIFTER register contains data being received or transmitted via the serial interface. It is
also used by the BDM firmware for temporary storage. The register can be read or written in all modes
but is not normally accessed by users.
The 16-bit ADDRESS register is temporary storage for BDM hardware and firmware commands. The
register can be read in all modes but is not normally accessed by users. It is written only by BDM hard-
ware.
The CCRSAV register is used to save the CCR of the users program when entering BDM. It is also used
for temporary storage in the BDM firmware. The register is initialized by the firmware to equal the CPU
CCR register.
15.3 Breakpoints
Hardware breakpoints are used to debug software on the MC68HC912BL16 by comparing actual ad-
dress and data values to predetermined data in setup registers. A successful comparison will place the
CPU in background debug mode (BDM) or initiate a software interrupt (SWI). Breakpoint features de-
signed into the MC68HC912B32 include:
Mode selection for BDM or SWI generation
Program fetch tagging for cycle of execution breakpoint
Second address compare in dual address modes
Range compare by disable of low byte address
Data compare in full feature mode for non-tagged breakpoint
Byte masking for high/low byte data compares
R/W compare for non-tagged compares
Tag inhibit on BDM TRACE
15.3.1 Breakpoint Modes
Three modes of operation determine the type of breakpoint in effect.
Dual address-only breakpoints, each of which will cause a software interrupt (SWI)
SHIFTER — BDM Shift Register
(BDM) $FF02, $FF03
Bit 15
14
13
12
11
10
9
Bit 8
S15
S14
S13
S12
S11
S10
S9
S8
Bit 7
6
5
4
3
2
1
Bit 0
S7
S6
S5
S4
S3
S2
S1
S0
ADDRESS — BDM Address Register
(BDM) $FF04, $FF05
Bit 15
14
13
12
11
10
9
Bit 8
A15
A14
A13
A12
A11
A10
A9
A8
Bit 7
6
5
4
3
2
1
Bit 0
A7
A6
A5
A4
A3
A2
A1
A0
CCRSAV — BDM CCR Holding Register
(BDM) $FF06
Bit 7
6
5
4
3
2
1
Bit 0
CCR7
CCR6
CCR5
CCR4
CCR3
CCR2
CCR1
CCR0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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