CHAPTER 4 PORT FUNCTIONS
Preliminary User’s Manual U19014EJ1V0UD
75
Figure 4-14. Block Diagram of P121 and P122
P122/X2/EXCLK/OCD0B
RD
WR
PORT
WR
PM
Output latch
(P122)
PM122
PM12
P12
RD
WR
PORT
WR
PM
Output latch
(P121)
PM121
PM12
P12
EXCLK, OSCSEL
OSCCTL
OSCSEL/
OSCSELS
OSCCTL
P121/X1/OCD0A
OSCSEL
OSCCTL
OSCSEL
OSCCTL
Internal bus
Selector
Selector
P12:
Port register 12
PM12:
Port mode register 12
OSCCTL: Clock operation mode select register
RD: Read
signal
WR
××
: Write
signal
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