UPD780204 Datasheet, PDF (147/418 Pages) NEC – 8-Bit Single-Chip Microcontrollers

CHAPTER 7 8-BIT TIMER/EVENT COUNTER
(2) External event counter
The number of pulses of an externally input signal can be measured.
(3) Square-wave output
A square wave with any selected frequency can be output.
Table 7-2. 8-Bit Timer/Event Counter Square-Wave Output Ranges
Minimum Pulse Width
2 x 1/fX (400 ns)
2² x 1/fX (800 ns)
2³ x 1/fX (1.6 µs)
2⁴ x 1/fX (3.2 µs)
2⁵ x 1/fX (6.4 µs)
2⁶ x 1/fX (12.8 µs)
2⁷ x 1/fX (25.6 µs)
2⁸ x 1/fX (51.2 µs)
2⁹ x 1/fX (102.4 µs)
2¹⁰ x 1/fX (204.8 µs)
2¹² x 1/fX (819.2 µs)
Maximum Pulse Width
2⁹ x 1/fX (102.4 µs)
2¹⁰ x 1/fX (204.8 µs)
2¹¹ x 1/fX (409.6 µs)
2¹² x 1/fX (819.2 µs)
2¹³ x 1/fX (1.64 ms)
2¹⁴ x 1/fX (3.28 ms)
2¹⁵ x 1/fX (6.55 ms)
2¹⁶ x 1/fX (13.1 ms)
2¹⁷ x 1/fX (26.2 ms)
2¹⁸ x 1/fX (52.4 ms)
2²⁰ x 1/fX (209.7 ms)
Resolution
2 x 1/fX (400 ns)
2² x 1/fX (800 ns)
2³ x 1/fX (1.6 µs)
2⁴ x 1/fX (3.2 µs)
2⁵ x 1/fX (6.4 µs)
2⁶ x 1/fX (12.8 µs)
2⁷ x 1/fX (25.6 µs)
2⁸ x 1/fX (51.2 µs)
2⁹ x 1/fX (102.4 µs)
2¹⁰ x 1/fX (204.8 µs)
2¹² x 1/fX (819.2 µs)
Remarks 1. fX: Main system clock oscillation frequency
2. Figures in parentheses apply to operation with fX = 5.0 MHz.
User’s Manual U11302EJ4V0UM
147