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Section 11 14-Bit PWM
Rev. 6.00 Sep 12, 2006 page 343 of 526
REJ09B0326-0600
Bit 0
Clock Select 0 (PWCR0):
Bit 0 selects the clock supplied to the 14-bit PWM. This bit is a
write-only bit; it is always read as 1.
Bit 0: PWCR0
Description
0
The input clock is
φ
/2 (t
φ
*
= 2/
φ
). The conversion period is 16,384/
φ
, with
a minimum modulation width of 1/
φ
(initial
value)
1
The input clock is
φ
/4 (t
φ
*
= 4/
φ
). The conversion period is 32,768/
φ
, with
a minimum modulation width of 2/
φ
.
Note:
*
t
φ
Period of PWM input clock
11.2.2
PWM Data Registers U and L (PWDRU, PWDRL)
PWDRU
Bit
7 6 5 4 3 2 1 0
PWDRU5 PWDRU4 PWDRU3 PWDRU2 PWDRU1
PWDRU0
Initial
value 1 1 0 0 0 0 0 0
Read/Write
W W W W W W
PWDRL
Bit
7 6 5 4 3 2 1 0
PWDRL7 PWDRL6 PWDRL5 PWDRL4 PWDRL3 PWDRL2 PWDRL1 PWDRL0
Initial
value 0 0 0 0 0 0 0 0
Read/Write W W W W W W W W
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.
Summary of Contents for F-ZTAT H8/3642A Series
Page 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Page 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Page 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Page 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Page 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Page 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Page 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Page 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Page 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...