Pwm Data Registers U And L (Pwdrum, Pwdrlm) - Renesas H8 Series Hardware Manual

8-bit single-chip microcomputer

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Section 11 10-Bit PWM

PWM Data Registers U and L (PWDRUm, PWDRLm)

Initial value

Initial value

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