
CHAPTER 2 PIN FUNCTION
18
(2) Control mode
These ports function as timer input/output, clock output, and buzzer output.
(a) TI1 and TI2
Pin for external count clock input to the 8-bit timer/event counter.
(b) TO0 to TO2
Timer output pins
(c) PCL
Clock output pin
(d) BUZ
Buzzer output pin
2.2.5 P70 to P74 (Port 7)
These are 5-bit input/output ports. They can be specified bit-wise for input or output ports by port mode register 7 (PM7).
Port 7 can drive LEDs directly.
P70 to P74 are N-ch open-drain outputs.
Mask ROM version can contain pull-up resistors with the mask option.
2.2.6 P80 and P81 (Port 8)
These are 2-bit output dedicated ports. Besides serving as output port, they function as an digit output for FIP
controller/driver.
Port 8 can drive LEDs directly.
The following operating modes can be specified bit-wise.
(1) Port mode
These ports function as 2-bit output dedicated ports. P80 and P81 are P-ch open-drain. Mask ROM version
can contain pull-down resistors with the mask option. The
μ
PD78P048A contains pull-down resistors.
(2) Control mode
These ports function as digit output pins (FIP0, FIP1) of the FIP controller/driver.
2.2.7 P90 to P97 (Port 9)
These are 8-bit output dedicated ports. Besides serving as output ports, they function as a digit output for FIP
controller/driver.
They can drive LEDs directly.
The following operating modes can be specified bit-wise.
(1) Port mode
These ports function as 8-bit output dedicated ports.
P90 to P97 are P-ch open-drain outputs. Mask ROM version can contain pull-up resistors with the mask option.
The
μ
PD78P048A contains pull-down resistors.
(2) Control mode
These ports function as pins for digit output of the FIP controller/driver (FIP2 to FIP9).