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ZGP323H Datasheet(PDF) 54 Page - Zilog, Inc. |
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ZGP323H Datasheet(HTML) 54 Page - Zilog, Inc. |
54 / 107 page ZGP323H Product Specification PS023803-0305 Functional Description 46 T16 Transmit Mode In NORMAL or PING-PONG mode, the output of T16 when not enabled, is depen- dent on CTR1, D0. If it is a 0, T16_OUT is a 1; if it is a 1, T16_OUT is 0. You can force the output of T16 to either a 0 or 1 whether it is enabled or not by program- ming CTR1 D3; D2 to a 10 or 11. When T16 is enabled, TC16H * 256 + TC16L is loaded, and T16_OUT is switched to its initial value (CTR1, D0). When T16 counts down to 0, T16_OUT is toggled (in NORMAL or PING-PONG mode), an interrupt (CTR2, D1) is generated (if enabled), and a status bit (CTR2, D5) is set. See Figure 25. Figure 25. 16-Bit Counter/Timer Circuits Global interrupts override this function as described in “Interrupts” on page 50. If T16 is in SINGLE-PASS mode, it is stopped at this point (see Figure 26). If it is in Modulo-N Mode, it is loaded with TC16H * 256 + TC16L, and the counting con- tinues (see Figure 27). You can modify the values in TC16H and TC16L at any time. The new values take effect when they are loaded. CTR2 D1 Negative Edge Positive Edge Z8® Data Bus IRQ3 CTR2 D2 SCLK Z8® Data Bus CTR2 D4, D3 Clock T16_OUT LO16 TC16H TC16L Clock Select 16-Bit Counter T16 HI16 Note: |
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