CHAPTER 2 PIN FUNCTIONS
User’s Manual U12688EJ4V0UM00
51
(3) P20 to P27 (Port 2) ··· 3-state I/O
Port 2, except for P20, which is an input-only pin, is an input/output port which can be set to input or output in
1-bit units.
Besides functioning as a port, in the control mode it operates as the input/output for the serial interface
(UART0/CSI0, UART1/CST1).
The operation mode can be set as port or control in 1-bit units, specified by the port 2 mode control register
(PMC2).
(a) Port mode
P21 to P27 can be set to input or output in bit units by the port 2 mode register (PM2). P20 is an
exclusive input port, and if a valid edge is input, it operates as an NMI input.
(b) Control mode
P22 to P27 can be set in the port/control mode in bit units by the PMC2 register.
(i)
NMI (Non-Maskable Interrupt Request) ··· input
This is the input pin for non-maskable interrupt requests.
(ii) TXD0, TXD1 (Transmit Data) ··· output
Output UART0, UART1 serial transmit data.
(iii) RXD0, RXD1 (Receive Data) ··· input
Input UART0, UART1 serial receive data.
(iv) SO0, SO1 (Serial Output) ··· output
Output CSI0, CSI1 serial transmit data.
(v) SI0, SI1 (Serial Input) ··· input
Input CSI0, CSI1 serial receive data.
(vi) SCK0, SCK1 (Serial Clock) ··· 3-state I/O
These are the input/output pins for the CSI0, CSI1 serial clock.
Summary of Contents for V850E/MS1 UPD703100
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