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HD64338523 Datasheet(PDF) 6 Page - Renesas Technology Corp |
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HD64338523 Datasheet(HTML) 6 Page - Renesas Technology Corp |
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6 / 544 page  Rev. 1.00 Dec. 19, 2007 Page vi of xx 2. Description of Numbers and Symbols Aspects of the notations for register names, bit names, numbers, and symbolic names in this manual are explained below. CMCSR indicates compare match generation, enables or disables interrupts, and selects the counter input clock. Generation of a WDTOVF signal or interrupt initializes the TCNT value to 0. 14.3 Operation The style "register name"_"instance number" is used in cases where there is more than one instance of the same function or similar functions. [Example] CMCSR_0: Indicates the CMCSR register for the compare-match timer of channel 0. In descriptions involving the names of bits and bit fields within this manual, the modules and registers to which the bits belong may be clarified by giving the names in the forms "module name"."register name"."bit name" or "register name"."bit name". (1) Overall notation (2) Register notation Rev. 0.50, 10/04, page 416 of 914 14.2.2 Compare Match Control/Status Register_0, _1 (CMCSR_0, CMCSR_1) 14.3.1 Interval Count Operation (4) (3) (2) Binary numbers are given as B'nnnn (B' may be omitted if the number is obviously binary), hexadecimal numbers are given as H'nnnn or 0xnnnn, and decimal numbers are given as nnnn. [Examples] Binary: B'11 or 11 Hexadecimal: H'EFA0 or 0xEFA0 Decimal: 1234 (3) Number notation An overbar on the name indicates that a signal or pin is active-low. [Example] WDTOVF Note: The bit names and sentences in the above figure are examples and have nothing to do with the contents of this manual. (4) Notation for active-low When an internal clock is selected with the CKS1 and CKS0 bits in CMCSR and the STR bit in CMSTR is set to 1, CMCNT starts incrementing using the selected clock. When the values in CMCNT and the compare match constant register (CMCOR) match, CMCNT is cleared to H'0000 and the CMF flag in CMCSR is set to 1. When the CKS1 and CKS0 bits are set to B'01 at this time, a f/4 clock is selected. |
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