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T80C5112-RKFEV 数据表(PDF) 53 Page - ATMEL Corporation |
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T80C5112-RKFEV 数据表(HTML) 53 Page - ATMEL Corporation |
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53 / 97 page  Rev. B - November 10, 2000 53 Preliminary T80C5112 Table 28. CCAPMn: PCA Modules Compare/Capture Control Registers Table 29. PCA Module Modes (CCAPMn Registers) There are two additional registers associated with each of the PCA modules. They are CCAPnH and CCAPnL and these are the registers that store the 16-bit count when a capture occurs or a compare should occur. When a module is used in the PWM mode these registers are used to control the duty cycle of the output (See Table 30 & Table 31) CCAPMn Address n=0-4 CCAPM0=0DAH CCAPM1=0DBH CCAPM2=0DCH CCAPM3=0DDH CCAPM4=0DEH - ECOMn CAPPn CAPNn MATn TOGn PWMm ECCFn Reset value X 0 0 0 0 0 0 0 Symbol Function - Not implemented, reserved for future use.a a. User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate. ECOMn Enable Comparator. ECOMn = 1 enables the comparator function. CAPPn Capture Positive, CAPPn = 1 enables positive edge capture. CAPNn Capture Negative, CAPNn = 1 enables negative edge capture. 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. TOGn Toggle. When TOGn = 1, a match of the PCA counter with this module's compare/capture register causes the CEXn pin to toggle. PWMn Pulse Width Modulation Mode. PWMn = 1 enables the CEXn pin to be used as a pulse width modulated output. ECCFn Enable CCF interrupt. Enables compare/capture flag CCFn in the CCON register to generate an interrupt. ECOMn CAPPn CAPNn MATn TOGn PWMm ECCFn Module Function 0 0 0 0 0 0 0 No Operation X 1 0000 X 16-bit capture by a positive-edge trigger on CEXn X 0 1000 X 16-bit capture by a negative trigger on CEXn X 1 1 0 0 0 X 16-bit capture by a transition on CEXn 100100 X 16-bit Software Timer / Compare mode. 1 0 0 1 1 0 X 16-bit High Speed Output 1 0 0 0 0 1 0 8-bit PWM 1 0 0 1 X 0 X Watchdog Timer (module 4 only) |
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