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R4F2112R Datasheet(PDF) 7 Page - Renesas Technology Corp |
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R4F2112R Datasheet(HTML) 7 Page - Renesas Technology Corp |
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7 / 984 page  Rev. 1.00 May 09, 2008 Page vii of xxvi 3. Description of Registers Each register description includes a bit chart, illustrating the arrangement of bits, and a table of bits, describing the meanings of the bit settings. The standard format and notation for bit charts and tables are described below. Indicates the bit number or numbers. In the case of a 32-bit register, the bits are arranged in order from 31 to 0. In the case of a 16-bit register, the bits are arranged in order from 15 to 0. Indicates the name of the bit or bit field. When the number of bits has to be clearly indicated in the field, appropriate notation is included (e.g., ASID[3:0]). A reserved bit is indicated by " −". Certain kinds of bits, such as those of timer counters, are not assigned bit names. In such cases, the entry under Bit Name is blank. (1) Bit (2) Bit name Indicates the value of each bit immediately after a power-on reset, i.e., the initial value. 0: The initial value is 0 1: The initial value is 1 −: The initial value is undefined (3) Initial value For each bit and bit field, this entry indicates whether the bit or field is readable or writable, or both writing to and reading from the bit or field are impossible. The notation is as follows: R/W: R/(W): R: W: The bit or field is readable and writable. The bit or field is readable and writable. However, writing is only performed to flag clearing. The bit or field is readable. "R" is indicated for all reserved bits. When writing to the register, write the value under Initial Value in the bit chart to reserved bits or fields. The bit or field is writable. Note: The bit names and sentences in the above figure are examples, and have nothing to do with the contents of this manual. (4) R/W Describes the function of the bit or field and specifies the values for writing. (5) Description Bit 15 13 to 11 10 9 0 All 0 0 0 1 R R/W R R Address Identifier These bits enable or disable the pin function. Reserved This bit is always read as 0. Reserved This bit is always read as 1. − ASID2 to ASID0 − − − Bit Name Initial Value R/W Description [Table of Bits] 14 − 0 R (1) (2) (3) (4) (5) Reserved These bits are always read as 0. |
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