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9.5
Port 7
9.5.1
Overview
Port 7 is an 8-bit I/O port. Port 7 pins also function as DMAC input pins (
DREQ0, TEND0,
DREQ1, and TEND1), bus control output pins (CS4 to CS7), external module output pins
(EXMSTP,
EXMS, and EXDTCE), and the manual reset input pin (MRES). The functions of pins
P77 to P74 are the same in all operating mode, but the functions of pins P73 to P70 depend on the
operating mode.
Figure 9-4 shows the port 7 pin configuration.
P77
P76 / EXMSTP
P75 /
EXMS
P74 /
MRES/EXDTCE
P73 /
TEND1/CS7
P72 /
TEND0/CS6
P71 /
DREQ1/CS5
P70 /
DREQ0/CS4
P77
P76
P75
P74
P73
P72
P71
P70
(input/output)
(input/output)/EXMSTP (output)
(input/output)/
EXMS (output)
(input/output)/
MRES(input)/EXDTCE (output)
(input)/
TEND1 (output)/CS7 (output)
(input)/
TEND0 (output)/CS6 (output)
(input)/
DREQ1 (input)/CS5 (output)
(input)/
DREQ0 (input)/CS4 (output)
Port 7 pins
Pin functions in modes 4 to 6
P77
P76
P75
P74
P73
P72
P71
P70
(input/output)
(input/output)/EXMSTP (output)
(input/output)
(input/output)/
TEND1 (output)
(input/output)
(input/output)/
DREQ0 (input)
/
EXMS (output)
/
MRES (input)/EXDTCE (output)
/
TEND0 (output)
/
DREQ1 (input)
Pin functions in mode 7
Port 7
Figure 9-4 Port 7 Pin Functions