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CYWUSB6953 数据表(PDF) 48 Page - Cypress Semiconductor |
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CYWUSB6953 数据表(HTML) 48 Page - Cypress Semiconductor |
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48 / 68 page ![]() CYRF69103 Document #: 001-07611 Rev *F Page 48 of 68 Table 20-2. Free Running Timer High-Order Byte (FRTMRH) [0x21] [R/W] Bit # 7 6 5 4 3 2 1 0 Field Free Running Timer [15:8] Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Default 0 0 0 0 00 0 0 Bits 7:0 Free Running Timer [15:8] When reading the free running timer, the low order byte must be read first and the high order second. When writing, the low order byte must be written first then the high order byte. Table 20-3. Programmable Interval Timer Low (PITMRL) [0x26] [R] Bit # 7 6 5 4 3 2 1 0 Field Prog Interval Timer [7:0] Read/Write R R R R RR R R Default 0 0 0 0 00 0 0 Bits 7:0 Prog Interval Timer [7:0] This register holds the low order byte of the 12-bit programmable interval timer. Reading this register causes the high order byte to be moved into a holding register allowing an automatic read of all 12 bits simultaneously. Table 20-4. Programmable Interval Timer High (PITMRH) [0x27] [R] Bit # 7 6 5 4 3 2 1 0 Field Reserved Prog Interval Timer [11:8] Read/Write -- -- -- -- RR R R Default 0 0 0 0 00 0 0 Bits 7:4 Reserved Bits 3:0 Prog Internal Timer [11:8] This register holds the high order nibble of the 12-bit programmable interval timer. Reading this register returns the high order nibble of the 12-bit timer at the instant that the low order byte was last read. Table 20-5. Programmable Interval Reload Low (PIRL) [0x28] [R/W] Bit # 7 6 5 4 3 2 1 0 Field Prog Interval [7:0] Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Default 0 0 0 0 00 0 0 Bits 7:0 Prog Interval [7:0] This register holds the lower 8 bits of the timer. While writing into the 12-bit reload register, write lower byte first then the higher nibble. [+] Feedback |
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