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S-7760A53XX-HCT1 Datasheet(PDF) 15 Page - Seiko Instruments Inc |
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S-7760A53XX-HCT1 Datasheet(HTML) 15 Page - Seiko Instruments Inc |
15 / 53 page PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT) Rev.1.3_00 S-7760A Seiko Instruments Inc. 15 6. DO0 to 3 Timer setting registers These registers are 8-bit registers which correspond to each port, with these registers, users can set delay time for the change of output at output ports (DO0 to 3). When delay time is set, its value is a multiple of timer scale. The multiple is integers 1 to 8. By setting the corresponding bits seen in Figure 17 in “1”, a multiple is selected to determine delay time. For each port, set only 1-bit in the bit that you set “1”. And if setting all 8 bits in “0”, output is not inverted even if the condition to start a timer matches. B7 LSB 8×T 7×T 6×T 5×T 4×T MSB B6 B5 B4 B3 B2 B1 B0 3×T 2×T 1×T R / W R / W R / W R / W R / W R / W R / W R / W DO0 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T DO1 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T DO2 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T DO3 Figure 17 Timer Setting Register DO0 to 3 Figure 17 shows the short-time timer scale setting. In case of a long-time setting, T is LT. The following options are available for timer setting. ・ Using an internal oscillation circuit/Switching the external clock input ・ Option setting for delay time (4 types) (1) When using an internal clock (Typ.) Option A : (Short-time setting scale, long-time setting scale) = (T, LT) = (5 µs, 320 µs) Option B : (Short-time setting scale, long-time setting scale) = (T, LT) = (10 µs, 640 µs) (2) When using an external clock (Period of input clock = T’) Option A : (Short-time setting scale, long-time setting scale) = (T, LT) = (T’, 64 × T’) Option B : (Short-time setting scale, long-time setting scale) = (T, LT) = (2 × T’, 128 × T’) |
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