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SPMCK16Z4MPV16 Datasheet(PDF) 103 Page - Freescale Semiconductor, Inc |
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SPMCK16Z4MPV16 Datasheet(HTML) 103 Page - Freescale Semiconductor, Inc |
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103 / 500 page  M68HC16 Z SERIES CENTRAL PROCESSING UNIT USER’S MANUAL 4-43 of BKPT or execution of the BGND instruction. IPIPE0 and IPIPE1 change function be- fore an exception signal can be generated. The development system must use FREEZE assertion as an indication that BDM has been entered. When BDM is exited, FREEZE is negated before initiation of normal bus cycles. IPIPE0 and IPIPE1 are valid when normal instruction prefetch begins. 4.14.4.4 BDM Commands Commands consist of one 16-bit operation word and can include one or more 16-bit extension words. Each incoming word is read as it is assembled by the serial interface. The microcode routine corresponding to a command is executed as soon as the com- mand is complete. Result operands are loaded into the output shift register to be shift- ed out as the next command is read. This process is repeated for each command until the CPU returns to normal operating mode. The BDM command set is summarized in Table 4-7. Refer to the CPU16 Reference Manual (CPU16RM/AD) for a BDM com- mand glossary. 4.14.4.5 Returning from BDM BDM is terminated when a resume execution (GO) command is received. GO refills the instruction pipeline from address (PK : PC – $0006). FREEZE is negated before the first prefetch. Upon negation of FREEZE, the BDM serial subsystem is disabled and the DSO/DSI signals revert to IPIPE0/IPIPE1 functionality. Table 4-7 Command Summary Command Mnemonic Description Read Registers from Mask RREGM Read contents of registers specified by command word register mask Write Registers from Mask WREGM Write to registers specified by command word register mask Read MAC Registers RDMAC Read contents of entire multiply and accumulate register set Write MAC Registers WRMAC Write to entire multiply and accumulate register set Read PC and SP RPCSP Read contents of program counter and stack pointer Write PC and SP WPCSP Write to program counter and stack pointer Read Data Memory RDMEM Read byte from specified 20-bit address in data space Write Data Memory WDMEM Write byte to specified 20-bit address in data space Read Program Memory RPMEM Read word from specified 20-bit address in program space Write Program Memory WPMEM Write word to specified 20-bit address in program space Execute from Current PK : PC GO Instruction pipeline flushed and refilled; instructions executed from current PC – $0006 Null Operation NOP Null command performs no operation Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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