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DS2148 датащи(PDF) 22 Page - Dallas Semiconductor |
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DS2148 датащи(HTML) 22 Page - Dallas Semiconductor |
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22 / 75 page ![]() DS2148/Q48 22 of 75 HARDWARE MODE PINOUT (BIS1 = 1, BIS0 = 1) Figure 4-3 5. HARDWARE MODE In hardware mode (BIS1 = 1, BIS0 = 1), pins 1-19, 23, 25, 31, and 44 are redefined to be used for initializing the DS2148. BPCLK (pin 31) defaults to a 16.384MHz output when in hardware mode. The RCL/LOTC (pin 25) is designated to RCL when in hardware mode. JABDS (CCR4.2) defaults to logic 0. The RHBE (CCR2.3) and THBE (CCR2.2) control bits are combined and controlled by HBE at pin 11 while the RSCLKE (CCR5.3) and TSCLKE (CCR5.2) bits are combined and controlled by SCLKE at pin 4. TCES (CCR2.1) and RCES (CCR2.0) are combined and controlled by CES at pin 12. The transmitter functions are combined and controlled by TX1 (pin 15) and TX0 (pin 14). LOOP1 (pin 17) and LOOP0 (pin 16) control the loopback functions. All other control bits default to the logic 0 setting. 1 EG L 2 ETS 3 NRZE 4 SCLKE 5 L2 6 L1 7 L0 8 DJA 9 JAMUX 10 JAS 11 HBE BIS1 33 BIS0 32 BPCLK 31 MCLK 30 HRST* 29 RRING 28 RTIP 27 TEST 26 RCL 25 PBEO 24 RT1 23 DS2148 Hardware Operation tie high tie high |
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