HD64F2145 Datasheet, PDF (776/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Vcc power supply
External capacitor for
power supply regulation
0.47 µF
(one,
or two
in parallel)
VCL
Product with internal
step-down function
VSS
Bypass
capacitor
10 µF
VCL
0.01 µF
Product without
internal step-down function
VSS
The VCC power supply should not be connected to the
VCL pin of the product with the internal step-down
function. (Connect the VCC power supply to other
VCC1 pins as usual.)
Be sure to connect power supply regulating capacitor(s)
to the VCL pin. One or two (parallel) 0.47-µF
multilayer capacitors should be used near the VCL pin.
For 3-V products used with the voltage of 3.6 V or less,
connect the Vcc power supply in the same way as the
products without the internal step-down function.
The VCC2 pin of the product without the internal step-down
function is allocated at the same location as the VCL pin of
the product with the internal step-down function.
It is recommended that a bypass capacitor be connected to
the power supply pins. (The values are reference values.)
< Product without internal step-down function >
HD64F2145BV
HD64F2148BV
< Product with internal step-down function >
HD64F2148B
Figure 28.5 Connection of VCL Capacitor
28.3 Timing Chart
28.3.1 Clock Timing
The clock timings are shown below.
t_cyc
t_CH
t_Cf
ø
t_CL
t_Cr
Figure 28.6 System Clock Timing
Rev. 2.0, 08/02, page 736 of 788