SH7058 Datasheet, PDF (1043/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

27.6 Usage Note
27.6.1 Notes on Connecting External Capacitor for Current Stabilization
The SH7058 includes an internal step-down curcuit to automatically reduce the microporocessor
power supply voltage to an appropriate level. Between this internal stepped-down power supply
(V_CL pin) and the V_SS pin, an capacitor (0.33 to 0.47 µF) for stabilizing the internal voltage.
Connection of the external capacitor is shown in figure 27.30. The external capacitor should be
located near the pin. Do not apply any power supply voltage to the V_CL pin.
External power-supply
stabilizing capacitor
One 0.33 to 0.47 µF capacitor
One 0.33 to 0.47 µF
capacitor
VCL ^VCL
VSS
VSS _VCL
VSS
One 0.33 to 0.47 µF
capacitor
Do not apply any power supply voltage to the VCL pin.
Use multilayer ceramics capacitors (one 0.33 to 0.47 µF
capacitor for each VCL pin), which should be located
near the pin.
Figure 27.30 Connection of V_CL Capacitor
27.6.2 Notes on Mode Pin Input
This electrical characteristics are specified for the combination of mode pins (FWE, MD2 to
MD0) specified in table 27.3. Characteristics of combinations other than those in table 27.3 cannot
be guaranteed.
When power is supplied and in hardware standby mode, mode setup time is determined by
tMDS1. When power-on reset is performed only by the RES pin, mode setup time is differs
according to the combination of input to the FWE and MD2 to MD0. When low is input to the
RES pin with the pins FWE and MD2 to MD0 operated in mode specified in table 27.3, the mode
setup time is determined by tMDS2. When combination which is not specified in table 27.3 is
input, the mode setup time is determined by tMDS1.
Rev. 3.0, 09/04, page 1002 of 1086