Freescale Semiconductor MPC5553 - Page 1109

MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
25-70 Freescale Semiconductor
25.11.17.3JTAG Sequence for Write Access of Memory-Mapped Resources
Table 25-44. Accessing Memory-Mapped Resources (Writes)
Step # TCLK clocks Description
1 13 Nexus Command = write to read/write access control/status register (RWCS)
2 37 Write RWCS (initialize write access mode and CNT value—data input on TDI)
3 13 Nexus Command = write to read/write address register (RWA)
4 37 Write RWA (initialize starting write address—data input on TDI)
5 13 Nexus Command = read read/write access data register (RWD)
6 37 Write RWD (data output on TDO)
7 — Wait for falling edge of RDY pin
8 — If CNT > 0, go back to Step #5