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TC9257AFG Scheda tecnica(PDF) 5 Page - Toshiba Semiconductor |
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TC9257AFG Scheda tecnica(HTML) 5 Page - Toshiba Semiconductor |
5 / 34 page TC9256, 57APG/AFG 2006-07-14 5 Functions and Operation Serial I/O Ports As the block diagram shows, the functions of the TC9256APG, TC9256AFG, TC9257APG and TC9257AFG are controlled by setting data in the 48 bits contained in each of the two sets of 24-bit registers. Each bit of data in these registers is transferred through the serial ports between the controller and the DATA, CLOCK and PERIOD pins. Each serial transfer consists of a total of 32 bits, with 8 address bits and 24 data bits. Since all functions are controlled in units of registers, the explanation here focuses on the 8-bit addresses and functions of each register. These registers consist of 24 bits and are selected by an 8-bit address. A list of the address assignments for each register is given below under Register Assignments. Register Address 24-Bit Composition No. of Bits Input Register 1 D0H PLL divisor setting Reference frequency setting PLL input and mode setting Crystal oscillator selection Total 16 4 2 2 24 Input Register 2 D2H General-purpose counter control (Including lock-detection bit control) I/O port and general-purpose counter switching bits I/O-5/CLK pin switching bit (DO2/OT-4 pin switching bit for TC9256APG and TC9256AFG) DO pin control TEST bit I/O port control (Also used as general-purpose counter input-selection bits) Output data Total 4 3 1 1 1 5 9 24 Output Register 1 D1H General-purpose counter numeric data Not used Total 22 2 24 Output Register 2 D3H Lock detection data I/O port control data Output data Input data (undefined during output port selection) Not used Total 5 5 4 5 5 24 On the falling edge of the PERIOD signal, the input data is latched in register 1 or register 2 and the function is performed. On the ninth falling edge of the CLOCK signal, the output data is latched in parallel in the output registers. The data are subsequently output serially from the data pin. |
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