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CHAPTER 2 PIN FUNCTIONS
User’s Manual U15109EJ3V0UD
70
(4) P30 to P37 (port 3) ··· 3-state I/O
P30 to P37 function as an 8-bit I/O port in which input and output can be specified in 1-bit units.
In addition to I/O port pins, these pins can also be used as I/O pins for the timer/counter, an address bus (A13 to
A15) for external memory expansion, and external interrupt request inputs.
(a) Port function
P30 to P37 can be set to input or output in 1-bit units using the port 3 mode register (PM3).
(b) Alternate functions
(i)
TI6 (timer input 6) ··· Input
This is the external count clock input pin for timer 6.
(ii)
TI71 (timer input 71) ··· Input
This is the external capture trigger input pin for timer 7.
(iii) TI80 (timer input 80) ··· Input
This is the external count clock input and external capture trigger input pin for timer 8.
(iv) TI81 (timer input 81) ··· Input
This is the external capture trigger input pin for timer 8.
(v)
TO6, TO8 (timer output 6, 8) ··· Output
These are the pulse signal output pins for timer 6 and timer 8.
(vi) A13 to A15 (address 13 to 15) ··· Output
These pins comprise an address bus for external access and operate as the A13 to A15 (22-bit
address) output pins. The output changes in synchronization with the rising edge of the clock in the T1
state of the bus cycle. When the timing sets the bus cycle to inactive, these pins hold the address of
the bus cycle immediately before.
A13 to A15 are available only for the V850/SC1 and V850/SC2.
(vii) INTP7 to INTP9 (interrupt request from peripherals) ··· Input
These are external interrupt request input pins.