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CS82C54Z Datasheet(PDF) 8 Page - Intersil Corporation |
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CS82C54Z Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 22 page 8 82C54 Since the Control Word Register and the three Counters have separate addresses (selected by the A1, A0 inputs), and each Control Word specifies the Counter it applies to (SC0, SC1 bits), no special instruction sequence is required. Any programming sequence that follows the conventions above is acceptable. CONTROL WORD FORMAT A1, A0 = 11; CS = 0; RD = 1; WR = 0 D7 D6 D5 D4 D3 D2 D1 D0 SC1 SC0 RW1 RW0 M2 M1 M0 BCD SC - SELECT COUNTER SC1 SC0 0 0 Select Counter 0 0 1 Select Counter 1 1 0 Select Counter 2 1 1 Read-Back Command (See Read Operations) RW - READ/WRITE RW1 RW0 0 0 Counter Latch Command (See Read Operations) 0 1 Read/Write least significant byte only. 1 0 Read/Write most significant byte only. 1 1 Read/Write least significant byte first, then most significant byte. M - MODE M2 M1 M0 0 0 0 Mode 0 0 0 1 Mode 1 X 1 0 Mode 2 X 1 1 Mode 3 1 0 0 Mode 4 1 0 1 Mode 5 BCD - BINARY CODED DECIMAL 0 Binary Counter 16-bit 1 Binary Coded Decimal (BCD) Counter (4 Decades) NOTE: Don’t Care bits (X) should be 0 to insure compatibility with future products. POSSIBLE PROGRAMMING SEQUENCE A1 A0 Control Word - Counter 0 1 1 LSB of Count - Counter 0 0 0 MSB of Count - Counter 0 0 0 Control Word - Counter 1 1 1 LSB of Count - Counter 1 0 1 MSB of Count - Counter 1 0 1 Control Word - Counter 2 1 1 LSB of Count - Counter 2 1 0 MSB of Count - Counter 2 1 0 POSSIBLE PROGRAMMING SEQUENCE A1 A0 Control Word - Counter 0 1 1 Control Word - Counter 1 1 1 Control Word - Counter 2 1 1 LSB of Count - Counter 2 1 0 LSB of Count - Counter 1 0 1 LSB of Count - Counter 0 0 0 MSB of Count - Counter 0 0 0 MSB of Count - Counter 1 0 1 MSB of Count - Counter 2 1 0 POSSIBLE PROGRAMMING SEQUENCE A1 A0 Control Word - Counter 2 1 1 Control Word - Counter 1 1 1 Control Word - Counter 0 1 1 LSB of Count - Counter 2 1 0 MSB of Count - Counter 2 1 0 LSB of Count - Counter 1 0 1 MSB of Count - Counter 1 0 1 LSB of Count - Counter 0 0 0 MSB of Count - Counter 0 0 0 |
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