hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 327

• Manufacturer Part Number: hd66100
• Description: H8/3867 Series
• Manufacturer: Renesas Electronics Corporation.

11.2.2
PWDRU and PWDRL form a 14-bit write-only register, with the upper 6 bits assigned to PWDRU
and the lower 8 bits to PWDRL. The value written to PWDRU and PWDRL gives the total high-
level width of one PWM waveform cycle.
When 14-bit data is written to PWDRU and PWDRL, the register contents are latched in the PWM
waveform generator, updating the PWM waveform generation data. The 14-bit data should
always be written in the following sequence:
1. Write the lower 8 bits to PWDRL.
2. Write the upper 6 bits to PWDRU.
PWDRU and PWDRL are write-only registers. If they are read, all bits are read as 1.
Upon reset, PWDRU and PWDRL are initialized to H'C000.
11.2.3
CKSTPR2 is an 8-bit read/write register that performs module standby mode control for peripheral
modules. Only the bit relating to the PWM is described here. For details of the other bits, see the
sections on the relevant modules.
312
Bit
Initial value
Read/Write
PWDRU
Bit
Initial value
Read/Write
PWDRL
Bit
Initial value
Read/Write
PWM Data Registers U and L (PWDRU, PWDRL)
Clock Stop Register 2 (CKSTPR2)
PWDRL7
—
—
7
1
—
—
W
7
1
7
0
PWDRL6
—
—
6
1
—
—
W
6
1
6
0
PWDRU5
PWDRL5
—
—
5
1
W
W
5
0
5
0
PWDRU4
PWDRL4
—
—
4
1
W
W
4
0
4
0
AECKSTP
PWDRU3
PWDRL3
R/W
W
W
3
1
3
0
3
0
PWDRU2
PWDRL2
WDCKSTP PWCKSTP LDCKSTP
R/W
W
W
2
0
2
0
2
1
PWDRU1
PWDRL1
R/W
W
W
1
0
1
0
1
1
PWDRU0
PWDRL0
W
W
0
0
0
0
R/W
0
1