SH7059 Datasheet, PDF (952/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

29. Electrical Characteristics
29.6 Usage Note
29.6.1 Notes on Connecting External Capacitor for Current Stabilization
This LSI includes an internal step-down circuit to automatically reduce the microprocessor 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 29.33. 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 _VCL
VSS
VSS
One 0.33 to 0.47 µF
capacitor
Note: 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 29.33 Connection of V_CL Capacitor
29.6.2 Notes on Mode Pin Input
This electrical characteristics are specified for the combination of mode pins (FWE, MD2 to MD0) specified in table 29.3.
Characteristics of combinations other than those in table 29.3 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 29.3,
the mode setup time is determined by tMDS2. When combination which is not specified in table 29.3 is input, the mode
setup time is determined by tMDS1.
Table 29.24 Mode Pin Input Timing
Item
Mode setup time 1
Mode setup time 2
Symbol
Min
Typ
Max
Unit
Remark
t_MDS1
t_MDS2
30
⎯
⎯
ms
Figure 29.34
10
⎯
⎯
t_cyc
Rev.3.00 Mar. 12, 2008 Page 862 of 948
REJ09B0177-0300