98
DDR7
Q
D
CK
DDR write
DR7
Q
D
CK
DR write
I/O-1/
IRQ
DR read
Output buffer
Input buffer
Sleep mode
Input pull-up MOS
(always switched-on)
V
CC
V
SS
DDR6
Q
D
CK
DDR write
DR6
Q
D
CK
DR write
I/O-2/
IRQ
DR read
Output buffer
Input buffer
Sleep mode
Input pull-up MOS
(always switched-on)
V
CC
V
SS
Falling edge
detector
Sleep mode
External interrupt
request (to CPU)
Internal data bus
Figure 9.1 I/O Port Block Diagram