S912XET512J3VALR Freescale Semiconductor, S912XET512J3VALR Datasheet - Page 712

• Manufacturer Part Number: S912XET512J3VALR
• Description: 16-bit Microcontrollers - MCU 16 BIT,512K FLASH
• Manufacturer: Freescale Semiconductor

Specifications of S912XET512J3VALR

• Rohs: yes
• Core: HCS12X
• Processor Series: MC9S12XE
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 50 MHz
• Program Memory Size: 512 KB
• Data Ram Size: 32 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3.13 V to 5.5 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: LQFP-112
• Mounting Style: SMD/SMT

Chapter 19 Pulse-Width Modulator (S12PWM8B8CV1)
19.4.2
The main part of the PWM module are the actual timers. Each of the timer channels has a counter, a period
register and a duty register (each are 8-bit). The waveform output period is controlled by a match between
the period register and the value in the counter. The duty is controlled by a match between the duty register
and the counter value and causes the state of the output to change during the period. The starting polarity
of the output is also selectable on a per channel basis. Shown below in
for the PWM timer.
19.4.2.1
Each PWM channel has an enable bit (PWMEx) to start its waveform output. When any of the PWMEx
bits are set (PWMEx = 1), the associated PWM output signal is enabled immediately. However, the actual
PWM waveform is not available on the associated PWM output until its clock source begins its next cycle
due to the synchronization of PWMEx and the clock source. An exception to this is when channels are
concatenated. Refer to
712
Clock Source
PWMEx
(Clock Edge
PWM Channel Timers
PWM Enable
Sync)
Gate
The first PWM cycle after enabling the channel can be irregular.
Up/Down
Section 19.4.2.7, “PWM 16-Bit Functions”
8-Bit Counter
Figure 19-19. PWM Timer Channel Block Diagram
PWMCNTx
Q
Q
MC9S12XE-Family Reference Manual Rev. 1.25
Reset
T
R
NOTE
8-bit Compare =
8-bit Compare =
PWMPERx
PWMDTYx
CAEx
for more detail.
Figure 19-19
T
R
Q
Q
PPOLx
From Port PWMP
M
U
Data Register
X
Freescale Semiconductor
is the block diagram
M
U
X
To Pin
Driver