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CS5535 датащи(PDF) 329 Page - National Semiconductor (TI) |
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CS5535 датащи(HTML) 329 Page - National Semiconductor (TI) |
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329 / 555 page ![]() Revision 0.8 329 www.national.com PIT Register Descriptions (Continued) 5.8.2.7 PIT Mode Control Word (PIT_MODECTL_WORD) I/O Address 43h Type R/W Reset Value 00h PIT_MODECTL_WORD Register Map 76 54 32 10 CNTR_SEL R/W_MODE CNTR_MODE BCD PIT_MODECTL_WORD Bit Descriptions Bit Name Description 7:6 CNTR_SEL Counter Select. 00: Counter 0. 01: Counter 1. 10: Counter 2. 11: Read-back Command (Note 1). Note 1. If bits [7:6] = 11: Register functions as Read Status Command Bit 5 = Latch Count, Bit 4 = Latch Status, Bit 3 = Select Counter 2, Bit 2 = Select Counter 1, Bit 1 = Select Counter 0, and Bit 0 = Reserved. 5:4 RW_MODE Current Read/Write Mode. 00: Counter latch command (Note 2). 01: R/W LSB only. 10: R/W MSB only. 11: R/W LSB, followed by MSB. Note 2. If bits [5:4] = 00: Register functions as Counter Latch Command Bits [7:6] = Selects Counter, and [3:0] = Don’t care. 3:1 CNTR_MODE Current Counter Mode. 000: Interrupt on terminal count. 001: Programmable one-shot. 010, 110: Rate generator. 011, 111: Square wave generator. 100: Software triggered pulse generator. 101: Hardware triggered pulse generator. 0BCD BCD Mode. 0: Binary. 1: BCD (binary coded decimal). |
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