M16C6KA_15 Datasheet, PDF (36/270 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Description

M16C/6KA Group
Wait Mode
Wait Mode
When a WAIT instruction is executed, the BCLK stops and the microcomputer enters the wait mode. In this
mode, oscillation continues but the BCLK and watchdog timer stop. Writing “1” to the WAIT peripheral func-
tion clock stop bit and executing a WAIT instruction stops the clock being supplied to the internal peripheral
functions, allowing power dissipation to be reduced. Table.WA-3 shows the status of the ports in wait mode.
Wait mode is cancelled by a hardware reset or interrupt. If an interrupt is used to cancel wait mode, the
microcomputer restarts from interrupt routine using as BCLK, the clock that had been selected when the
WAIT instruction was executed.
Table.WA-3 Port status during wait mode
Pin
Single-chip mode
CLKOUT
When f8, f32 selected Does not stop when the WAIT peripheral function clock stop
bit is “0”.
When the WAIT peripheral function clock stop bit is “1”, the
status immediately prior to entering wait mode is maintained.
Port
maintained the status immediately prior to entering wait mode
Rev.1.00 Jul 16, 2004 page 34 of 266
REJ03B0100-0100Z