CHAPTER 2 PIN FUNCTIONS
(6) P70 to P77 (port 7) ... Input
Port 7 is an 8-bit input-only port in which all the pins are fixed to input.
In addition to functioning as input ports pins, P70 to P77 can also be used for A/D converter (ADC) analog
input in the control mode.
Normally, when port and function pins are shared, their operation can be selected by the port mode control
register, but in the case of P70 to P77, such a register does not exist. Therefore, these pins cannot be
switched between input port and analog input pins for the A/D converter (ADC). For the state of each pin, read
the port.
(a) Port mode
P70 to P77 are input-only pins.
(b) Control mode (alternate function)
P70 to P77 are shared with ANI0 to ANI7, but switching is not possible.
(i) ANI0 to ANI7 (analog input) ... Input
These are the analog input pins to the A/D converter (ADC).
(7) P90, P91, P96 to P99, P913 to P915 (port 9) ... I/O
Port 9 is a 9-bit I/O port for which input and output can be set in 1-bit units.
In addition to functioning as an I/O port, P90, P91, P96 to P99, and P913 to P915 can also be used for serial
interface (UART1, CSI01) I/O, 16-bit timer I/O, 8-bit timer output, and external interrupt request input in the
control mode.
Moreover, they can also function as 16-bit timer inputs, 8-bit timer inputs, and key interrupts in the input port mode.
The port mode and control mode can be selected as the operation mode for each bit, and are specified by the
port 9 mode control register (PMC9).
P90, P91, P96 to P99, and 913 to P915 can be set to control mode 2 in 1-bit units by the port 9 function
control register (PFC9). (There is no control mode 1 for these pins. Setting to control mode 1 (PMC9n bit of
port 9 mode control register (PMC9) = 1 and PFC9n bit of PFC9 register = 0) is prohibited since output is
undefined.) (n = 0, 1, 6 to 9, 13 to 15)
Normal output or N-ch open-drain output can be selected for P98 and P99.
(a) Port mode
P90, P91, P96 to P99, and P913 to P915 can be set to input or output in 1-bit units by the port 9 mode
register (PM9).
(b) Control mode (alternate function)
P90, P91, P96 to P99, and P913 to P915 can be set to the port mode or control mode in 1-bit units by the
port 9 mode control register (PMC9).
(i) TXD1 (transmit data) ... Output
This is the serial transmit data output pin for UART1.
(ii) RXD1 (receive data) ... Input
This is the serial receive data input pin for UART1.
(iii) TI51 (timer input) ... Input
This is the external count clock input pin for the 8-bit timer.
User’s Manual U15862EJ3V0UD
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NEC [ NEC ]
