SH7144_08 Datasheet, PDF (96/930 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series

3. MCU Operating Modes
3.5 Initial State in This LSI
In the initial state of this LSI, some of on-chip modules are set in module standby state for saving
power. When operating these modules, clear module standby state according to the procedure in
section 24, Power-Down Modes.
3.6 Note on Changing Operating Mode
When changing operating mode while power is applied to this LSI, make sure to do it in the
power-on reset state (that is, the low level is applied to the RES pin). In addition, when changing
clock mode, secure the reset oscillation stabilization time (t_OSC1) after clock mode change.
When changing other than clock mode
When changing clock mode
CK
MD3 to MD0
RES
t_MDS*¹
t_OSC1*²
Notes: 1. See section 26.3.3, Control Signal Timing.
2. See section 26.3.2, Clock Timing.
Figure 3.2 Reset Input Timing when Changing Operating Mode
Rev.4.00 Mar. 27, 2008 Page 52 of 882
REJ09B0108-0400