CHAPTER 2 PIN FUNCTIONS40 User’s Manual U11302EJ4V0UM(2) Control modeP30 to P37 function as timer I/O, clock output, and buzzer output pins.(a) TI1 and TI2Pins for external count clock input to the 8-bit timer/event counter.(b) TO0 to TO2Timer output pins(c) PCLClock output pin(d) BUZBuzzer output pin2.2.5 P70 to P74 (Port 7)These pins constitute a 5-bit I/O port. They can be specified in input or output mode in 1-bit units using portmode register 7 (PM7).Port 7 can drive LEDs directly.P70 to P74 are N-ch open-drain outputs. In mask ROM versions, use of pull-up resistors can be specified withthe mask option.2.2.6 P80 to P87 (Port 8)These pins constitute an 8-bit output-only port. Besides serving as output port pins, they function as display outputsfor the VFD controller/driver.Port 8 can drive LEDs directly.The following operating modes can be specified in 1-bit units.(1) Port modeP80 to P87 function as an 8-bit output-only port.P80 to P87 are P-ch open-drain outputs. In mask ROM versions, use of pull-down resistors can be specifiedwith the mask option.(2) Control modeP80 to P87 function as the display output pins of the VFD controller/driver (FIP13 to FIP20).2.2.7 P90 to P97 (Port 9)These pins constitute an 8-bit output-only port. Besides serving as output port pins, they function as display outputsfor the VFD controller/driver.Port 9 can drive LEDs directly.The following operating modes can be specified in 1-bit units.(1) Port modeP90 to P97 function as an 8-bit output-only port.P90 to P97 are P-ch open-drain outputs. In mask ROM versions, use of pull-down resistors can be specifiedwith the mask option.(2) Control modeP90 to P97 function as the display output pins of the VFD controller/driver (FIP21 to FIP28).
