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P89V51RB2BBC bảng dữ liệu(PDF) 49 Page - NXP Semiconductors |
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P89V51RB2BBC bảng dữ liệu(HTML) 49 Page - NXP Semiconductors |
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49 / 77 page  Philips Semiconductors P89V51RB2/RC2/RD2 8-bit microcontrollers with 80C51 core Product data Rev. 03 — 02 December 2004 49 of 77 9397 750 14341 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Table 39: CMOD - PCA counter mode register (address D9H) count pulse select CPS1 CPS0 Select PCA input 0 0 0 Internal clock, fosc / 6 0 1 1 Internal clock, fosc / 6 1 0 2 Timer 0 overflow 1 1 3 External clock at ECI/P1.2 pin (max rate = fosc / 4) Table 40: CCON - PCA counter control register (address 0D8H) bit allocation Bit addressable; Reset value: 00H Bit 7 6 5 4 3 2 1 0 Symbol CF CR - CCF4 CCF3 CCF2 CCF1 CCF0 Table 41: CCON - PCA counter control register (address 0D8H) bit description Bit Symbol Description 7 CF PCA Counter Overflow Flag. Set by hardware when the counter rolls over. CF flags an interrupt if bit ECF in CMOD is set. CF may be set by either hardware or software but can only be cleared by software. 6 CR PCA Counter Run Control Bit. Set by software to turn the PCA counter on. Must be cleared by software to turn the PCA counter off. 5 - Reserved for future use. Should be set to ‘0’ by user programs. 4 CCF4 PCA Module 4 Interrupt Flag. Set by hardware when a match or capture occurs. Must be cleared by software. 3 CCF3 PCA Module 3 Interrupt Flag. Set by hardware when a match or capture occurs. Must be cleared by software. 2 CCF2 PCA Module 2 Interrupt Flag. Set by hardware when a match or capture occurs. Must be cleared by software. 1 CCF1 PCA Module 1 Interrupt Flag. Set by hardware when a match or capture occurs. Must be cleared by software. 0 CCF0 PCA Module 0 Interrupt Flag. Set by hardware when a match or capture occurs. Must be cleared by software. Table 42: CCAPMn - PCA modules compare/capture register (address CCAPM0 0DAH, CCAPM1 0DBH, CCAPM2 0DCH, CCAPM3 0DDH, CCAPM4 0DEH) bit alloc. Not bit addressable; Reset value: 00H Bit 7 6 5 4 3 2 1 0 Symbol - ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn Table 43: CCAPMn - PCA modules compare/capture register (address CCAPM0 0DAH, CCAPM1 0DBH, CCAPM2 0DCH, CCAPM3 0DDH, CCAPM4 0DEH) bit desc. Bit Symbol Description 7 - Reserved for future use. Should be set to ‘0’ by user programs. 6 ECOMn Enable Comparator. ECOMn = 1 enables the comparator function. 5 CAPPn Capture Positive, CAPPn = 1 enables positive edge capture. 4 CAPNn Capture Negative, CAPNn = 1 enables negative edge capture. |
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