
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15905EJ2V1UD
149
(3) Block diagram
Figure 4-25. Block Diagram of PCM0 and PCM3
Internal
bus
WRPMC
RD
Address
WAIT, HLDRQ input
WRPORT
PCM0/WAIT,
PCM3/HLDRQ
PMCCMn
Output latch
(PCMn)
Selector
WRPM
PMCMn
PMCCM
PCM
PMCM
Remarks 1. PCM:
Port register CM
PMCM:
Port mode register CM
PMCCM: Port mode control register CM
2. n = 0 or 3