Overview Of The Ppg Timer - Fujitsu FR60 Hardware Manual

CHAPTER 8 PROGRAMMABLE PULSE GENERATOR (PPG) TIMER
8.1

Overview of the PPG Timer

The programmable pulse generator (PPG) efficiently outputs highly accurate PWM
waveforms.
The MB91F355A/355A/354A/F356B/F357B have six built-in PPG timer channels.
The MB91F353A/351A/352A/353A have three built-in PPG timer channels.
■ Characteristics of PPG Timer
• Each channel consists of a 16-bit down counter, 16-bit data register with a cycle setting buffer, 16-bit
compare register with a duty setting buffer, and pin control block.
• One of the four count clocks can be selected for the 16-bit down counter:
• Peripheral system clock
∞ φ
φ/4
•
φ/16
•
φ/64
•
• A reset or counter borrow can initialize the counter value to "FFFF
• Each channel has PPG output (PPG0 to PPG5).
Note: The MB91F353A/351A/352A/353A have three channels for PPG output (PPG0, PPG2, and
• Overview of registers
• Cycle setting register: Data register for reload with buffer
Data is transferred from the buffer when an activation trigger signal is detected and a counter
borrow occurs.
The PPG output is inverted when a counter borrow occurs.
• Duty setting register: Compare register with buffer
PPG output is inverted when the value of this register and the counter value match.
• Outline of pin control
• Set to "1" when the duty matches (priority)
• Reset to "0" when a counter borrow occurs.
• Output-value fixed mode is available to facilitate output of all-"L" (or "H").
• The polarity can be specified.
• An interrupt request can be generated as one of the following combinations:
• Activation of PPG timer (software trigger or trigger input)
• Generation of counter borrow (cycle match)
• Generation of duty match
• Generation of counter borrow (cycle match) or duty match
• Multiple channels can be activated at one time by using software or other interval timers.
Restart during operation can also be set.
298
PPG4); it does not have PPG1, PPG3, and PPG5.
".
H