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P89V51RB2BBC Datasheet(PDF) 49 Page - NXP Semiconductors |
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P89V51RB2BBC Datasheet(HTML) 49 Page - NXP Semiconductors |
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49 / 80 page  P89V51RB2_RC2_RD2_5 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 05 — 12 November 2009 49 of 80 NXP Semiconductors P89V51RB2/RC2/RD2 8-bit microcontrollers with 80C51 core Table 37. 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 / 2 1 0 2 Timer 0 overflow 1 1 3 External clock at ECI/P1.2 pin (max rate = fosc / 4) Table 38. 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 39. 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 40. CCAPMn - PCA modules compare/capture register (address CCAPM0 0DAH, CCAPM1 0DBH, CCAPM2 0DCH, CCAPM3 0DDH, CCAPM4 0DEH) bit allocation Not bit addressable; Reset value: 00H Bit 7 6 5 4 3 2 1 0 Symbol - ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn Table 41. CCAPMn - PCA modules compare/capture register (address CCAPM0 0DAH, CCAPM1 0DBH, CCAPM2 0DCH, CCAPM3 0DDH, CCAPM4 0DEH) bit description 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. 3 MATn Match. When MATn = 1 a match of the PCA counter with this module’s compare/capture register causes the CCFn bit in CCON to be set, flagging an interrupt. |
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