SH7058 Datasheet, PDF (992/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

NMI signal. This clock is supplied only to the oscillation settling counter which counts the
oscillation stablizing time.
Counting the oscillation settling time by the oscillation settling counter is used to indicate that the
clock has stabilized, so the clock is supplied to the entire chip, software standby mode is canceled,
and NMI exception processing begins.
The oscillation settling counter overflows when it counts 2¹⁴=16384 with the input clock
frequency. Since the frequency of this counting clock is unstable until the PLL multiplication
curcuit is locked in, the absolute time is not fixed, and the CK pin signal output is in the high level
for the meantime.
When canceling standby mode with an NMI pin set for falling edge, be sure that the NMI pin level
upon entering software standby (when the clock is halted) is high, and that the NMI pin level upon
returning from software standby (when the clock starts after oscillation stabilization) is low. When
canceling software standby mode with an NMI pin set for rising edge, be sure that the NMI pin
level upon entering software standby (when the clock is halted) is low, and that the NMI pin level
upon returning from software standby (when the clock starts after oscillation stabilization) is high.
Cancellation by Power-On Reset: A power-on reset of the SH7058 caused by driving the RES
pin low cancels software standby mode.
Rev. 3.0, 09/04, page 951 of 1086