Datasheet

Section 14 14-Bit PWM
Rev. 2.00 Sep. 23, 2005 Page 236 of 444
REJ09B0068-0200
14.2 Input/Output Pin
Table 14.1 shows the 14-bit PWM pin configuration.
Table 14.1 Pin Configuration
Name Abbreviation I/O Function
14-bit PWM square-wave
output
PWM Output 14-bit PWM square-wave output pin
14.3 Register Descriptions
The 14-bit PWM has the following registers.
• PWM control register (PWCR)
• PWM data register U (PWDRU)
• PWM data register L (PWDRL)
14.3.1 PWM Control Register (PWCR)
PWCR selects the conversion period.
Bit Bit Name
Initial
Value R/W Description
7 to 1  All 1  Reserved
These bits are always read as 1 and cannot be
modified.
0 PWCR0 0 R/W Clock Select
0: The input clock is φ/2 (tφ = 2/φ)
 The conversion period is 16384/φ, with a
minimum modulation width of 1/φ
1: The input clock is φ/4 (tφ = 4/φ)
 The conversion period is 32768/φ, with a
minimum modulation width of 2/φ
[Legend]
tφ: Period of PWM clock input