HD6473887 Datasheet, PDF (368/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

Bits 3 to 0: Charge/discharge pulse duty cycle select (CDS3 to CDS0)
Bit 3
CDS3
0
0
0
0
0
0
0
0
1
1
Bit 2
CDS2
0
0
0
0
1
1
1
1
0
1
Bit 1
CDS1
0
0
1
1
0
0
1
1
*
*
Bit 0
CDS0
0
1
0
1
0
1
0
1
*
*
Duty Cycle
1
1/8
2/8
3/8
4/8
5/8
6/8
0
1/16
1/32
Notes
Fixed high
Fixed low
(initial value)
*: Don’t care
Bits 3 to 0 select the duty cycle while the power supply split-resistance is connected to the power
supply circuit.
When a 0 duty cycle is selected, the power supply split-resistance is permanently disconnected
from the power supply circuit, so power should be supplied to pins V1, V2, and V3 by an external
circuit.
Figure 13-2 shows the waveform of the charge/discharge pulses. The duty cycle is Tc/Tw.
1 frame
TW
COM1
Tc
Tdc
Charge/discharge
pulses
Tc : Power supply split-resistance
connected
Tdc : Power supply split-resistance
disconnected
Figure 13-2 Example of A Waveform with 1/2 Duty and 1/2 Bias
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