Chapter 7 8-Bit Timer; 8-Bit Timer Functions - NEC mPD789426 Series User Manual

7.1 8-Bit Timer Functions

An 8-bit timer (one channel, timer 50) and an 8-bit timer/event counter (one channel, timer 60) are incorporated in
the µ PD789426, 789436, 799446, 789456 Subseries. The operation modes listed in the following table can be set
via mode register settings.
Mode
8-bit timer counter mode
(Discrete mode)
16-bit timer counter mode
(Cascade connection mode)
Carrier generator mode
PWM output mode
(1) 8-bit timer counter mode (discrete mode)
The following functions can be used in this mode.
• Interval timer with 8-bit resolution
• External event counter with 8-bit resolution (timer 40 only)
• Square wave output with 8-bit resolution
(2) 16-bit timer counter mode (cascade connection mode)
Operation as a 16-bit timer/event counter is enabled during cascade connection mode.
The following functions can be used in this mode.
• Interval timer with 16-bit resolution
• External event counter with 16-bit resolution
• Square wave output with 16-bit resolution
(3) Carrier generator mode
The carrier clock generated by timer 60 is output in cycles set by timer 50.
(4) PWM output mode
(a) Timer 50: Free-running mode
The timer output status inverts repeatedly due to a match between TM50 and CR50 and TM50
overflow, and pulses of any duty ratio are output.

CHAPTER 7 8-BIT TIMER

Table 7-1. Operation Modes
Channel Timer 50
Available
Available
(Free-running mode)
User's Manual U15075EJ1V0UM00
Timer 60
Available
Available
Available
Available
(Pulse generator mode)
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