hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 436

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 11 10-Bit PWM
11.2.2
PWDRUm and PWDRLm form a 10-bit write-only register, with the upper 2 bits assigned to
PWDRUm and the lower 8 bits to PWDRLm. The value written to PWDRUm and PWDRLm
gives the total high-level width of one PWM waveform cycle.
When 10-bit data is written to PWDRUm and PWDRLm, the register contents are latched in the
PWM waveform generator, updating the PWM waveform generation data. The 10-bit data should
always be written in the following sequence:
1. Write the lower 8 bits to PWDRLm.
2. Write the upper 2 bits to PWDRUm for the same channel.
PWDRUm and PWDRLm are write-only registers. If they are read, all bits are read as 1.
Upon reset, PWDRUm is initialized to H'FC, and PWDRLm to H'00.
Rev. 7.00 Mar 10, 2005 page 394 of 652
REJ09B0042-0700
PWDRUm
Bit
Initial value
Read/Write
PWDRLm
Bit
Initial value
Read/Write
PWM Data Registers U and L (PWDRUm, PWDRLm)
PWDRLm7


W
7
1
7
0
PWDRLm6
W


6
0
6
1
PWDRLm5


W
5
1
5
0
PWDRLm4
W


4
0
4
1
PWDRLm3


W
3
1
3
0
PWDRLm2


W
2
1
2
0
PWDRUm1
PWDRLm1
W
W
1
0
1
0
PWDRUm0
PWDRLm0
W
W
0
0
0
0