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CHAPTER 16 8/16-BIT PPG
16.1
Outline of 8/16-bit PPG
The 8/16-bit Programmable Pulse Generator (PPG) consists of two eight-bit down
counters, four eight-bit reload registers, one 16-bit control register, two external pulse
output signals, and two interrupt outputs. The following functions are implemented:
■ Function of 8/16-bit PPG
●
8-bit PPG output, 2-channel independent operation mode:
Two independent channels of PPG output operation are implemented.
●
16-bit PPG output operation mode:
One channel of 16-bit PPG output operation is implemented.
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8+8-bit PPG output operation mode:
8-bit PPG output operation is implemented at specified intervals, using channel 0 output as channel 1 clock
input.
●
PPG output operation:
Pulse waves are output at specified intervals and duty ratio. With an external circuit, this module can be
used as a D/A converter.
The MB90390 Series contains six PPG's. The following sections only describe the functionality of the
PPG0/PPG1. The remaining PPG's have the identical function and the register addresses should be found
in the I/O map.
Figure 16.1-1 shows the connection of internal PPG modules and external pins.
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