Pin States - NEC Renesas V850/SC1 User Manual

32-bit single-chip microcontrollers

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2.2 Pin States

The operation states of pins in various operating modes are described below.

Operating Mode

DSTB, WRL, WRH, RD

Pins (except the CLKOUT pin) are used as port pins (input mode) after reset.

The bus cycle inactivation timing occurs when the internal memory area is specified by the program

counter (PC) in the external expansion mode.

• When the external memory area has not been accessed even once after reset is released and the

external expansion mode is set: Undefined

• When the bus cycle is inactivated after access to the external memory area, or when the external

memory area has not been accessed even once after the external expansion mode is released and

set again: The state of the external bus cycle when the external memory area accessed last is held.

Low level (L) when in clock output inhibit mode

High impedance

State during previously set external bus cycle is held

Low-level output

High-level output

Input without sampling

Table 2-3. Pin Operation States in Various Operating Modes

User's Manual U15109EJ3V0UD

PIN FUNCTIONS

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