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SM79108L25 数据表(PDF) 8 Page - SyncMOS Technologies,Inc |
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SM79108L25 数据表(HTML) 8 Page - SyncMOS Technologies,Inc |
8 / 26 page January 2003 Specifications subject to change without notice,contact your sales representatives for the most recent information. 8/26 Preliminary Ver 1.0 SM79108 01/03 SyncMOS Technologies Inc. SM79108 Preliminary 3. Port 4 for PLCC or QFP package: The bit addressable port 4 is available with PLCC or QFP package. The port 4 has only 4 pins and its port address is located at 0D8H. The function of port 4 is the same as the function of port 1, port 2 and port 3. Port4 (P4, 0D8H) The bit 3, bit 2, bit 1, bit 0 output the setting to pin P4.3, P4.2, P4.1, P4.0 respectively. 4. SPWM Function Description: The 8-bit SPWM channel is composed of an 8-bit register which contains a 5-bit SPWM in MSB portion and a 3-bit binary rate multiplier (BRM) in LSB portion. The value programmed in the 5-bit SPWM portion will determine the pulse length of the output. The 3-bit BRM portion will generate and insert certain narrow pulses among an 8-SPWM-cycle frame. The number of pulses generated is equal to the number programmed in the 3-bit BRM portion. The usage of the BRM is to generate equivalent 8-bit resolution SPWM type DAC with reasonably high repetition rate through 5-bit SPWM clock speed. The SPFS[1:0] settings of SPWMC (0A3H) register are divided of Fosc to be SPWM clock, Fosc/ 2^(SPFS[1:0]+1). The SPWM output cycle frame repetition rate (frequency) equals (SPWM clock)/32 which is [Fosc/ 2^(SPFS[1:0]+1)]/32. 4.1 SPWM Registers - P1CON, SPWMC0, SPWMD0 SPWM Registers - Port1 Configuration Register (P1CON, 9BH) SPWME0 : When the bit set to one, the corresponding SPWM pin is active as SPWM function. When the bit reset to zero, the corresponding SPWM pin is active as I/O pin. Four bits are cleared upon reset. PWME0 : When the bit set to one, the corresponding PWM pin is active as PWM function. When the bit reset to zero, the corresponding PWM pin is active as I/O pin. Four bits are cleared upon reset. SPWM Registers - SPWM Control Register (SPWMC, 0A3H) bit-7 bit-0 Unused Unused Unused Unused P4.3 P4.2 P4.1 P4.0 Read / Write: ---- R/W R/W R/W R/W Reset value: **** 1111 bit-7 bit-0 Unused Unused PWME0 Unused Unused SPWME0 Unused Unused Read / Write: - - R/W - - R/W - - Reset value: * * 0 * * 0 * * bit-7 bit-0 Unused Unused Unused Unused Unused Unused SPFS1 SPFS0 Read / Write: ------ R/W R/W Reset value: ****** 0 0 |
类似零件编号 - SM79108L25 |
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类似说明 - SM79108L25 |
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