Chapter 7 8-Bit Timer/Event Counter; 8-Bit Timer/Event Counter Functions - NEC mPD789026 Subseries User Manual

7.1 8-Bit Timer/Event Counter Functions

8-bit timer/event counter 00 (TM00) has the following functions:
• Interval timer
• External event counter
• Square wave output
(1) 8-bit interval timer
When the 8-bit timer/event counter is used as an interval timer, it generates an interrupt at any time
intervals set in advance.
Minimum Interval Time
1/f (200 ns)
X
(6.4 µ s)
5
2 /f
X
Remarks 1. f : System clock oscillation frequency
X
2. The parenthesized values apply to operation at f
(2) External event counter
The number of pulses of an externally input signal can be measured.
(3) Square wave output
A square wave of arbitrary frequency can be output.
Table 7-2. Square Wave Output Range of 8-Bit Timer/Event Counter 00
Minimum Pulse Width
1/f (200 ns)
X
(6.4 µ s)
5
2 /f
X
Remarks 1. f : System clock oscillation frequency
X
2. The parenthesized values apply to operation at f

CHAPTER 7 8-BIT TIMER/EVENT COUNTER

Table 7-1. Interval Time of 8-Bit Timer/Event Counter 00
Maximum Interval Time
(51.2 µ s)
8
2 /f
X
13
2 /f (1.64 ms)
X
Maximum Pulse Width
(51.2 µ s)
8
2 /f
X
13
2 /f (1.64 ms)
X
User's Manual U11919EJ3V0UM00
Resolution
1/f (200 ns)
X
(6.4 µ s)
5
2 /f
X
= 5.0 MHz.
X
Resolution
1/f (200 ns)
X
(6.4 µ s)
5
2 /f
X
= 5.0 MHz.
X
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