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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT56RB688 데이터시트(PDF) 33 Page - Holtek Semiconductor Inc |
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HT56RB688 데이터시트(HTML) 33 Page - Holtek Semiconductor Inc |
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33 / 164 page  Interrupt Control Registers These 8-bit registers, known as INTC0, INTC1, INTC2, MFIC0, MFIC1 and MISC0, control the overall operations of the device interrupt functions. By setting various bits within these registers using standard bit manipulation instructions, the enable/disable function of each interrupt can be independently controlled. A master interrupt bit within the INTC0 register, the EMI bit, acts like a global enable/disable control and is used to set all of the interrupt enable bits on or off. This bit is cleared when an interrupt subroutine is entered to disable further interrupt and is set by executing the ²RETI² instruction. The MISC0 register is used to select the active edges for the two external interrupt pins INT0 and INT1. Timer/Event Counter Registers The device contains several internal 8-bit and 16-bit Timer/Event Counters. The registers TMR0, TMR2, TMR3 and the register pair TMR1L/TMR1H are the locations where the timer values are located. These registers can also be preloaded with fixed data to allow different time intervals to be setup. The associated control registers, TMR0C, TMR1C, TMR2C and TMR3C contain the setup information for these timers, which determines in what mode the timer is to be used as well as containing the timer on/off control function. Input/Output Ports and Control Registers Within the area of Special Function Registers, the I/O data registers and their associated control registers play a prominent role. All I/O ports have a designated register correspondingly labeled as PA, PB, PC, PD, PE and PF. These labeled I/O registers are mapped to specific addresses within the Data Memory as shown in the Data Memory table, which are used to transfer the appropriate output or input data on that port. With each I/O port there is an associated control register labeled PAC, PBC, PCC, PDC, PEC and PFC also mapped to specific addresses within the Data Memory. The control register specifies which pins of that port are set as inputs and which are set as outputs. To setup a pin as an input, the corresponding bit of the control register must be set high while for an output it must be set low. During program initialization, it is important to first setup the control registers to specify which pins are outputs and which are inputs before reading data from or writing data to the I/O ports. One flexible feature of these registers is the ability to directly program single bits using the ²SET [m].i² and ²CLR [m].i² instructions. The ability to change I/O pins from output to input and vice versa by manipulating specific bits of the I/O control registers during normal program operation is a useful feature of these devices. Pulse Width Modulator Registers The device contains multiple Pulse Width Modulator outputs each with their own related independent control register pair, known as PWM0L/PWM0H, PWM1L/PWM1H, PWM2L/PWM2H and PWM3L/PWM3H. The 12-bit contents of each register pair, which defines the duty cycle value for the modulation cycle of the Pulse Width Modulator, along with an enable bit are contained in these register pairs. A/D Converter Registers - ADRL, ADRH, ADCR, ACSR The device contains a multiple channel 12-bit A/D converter. The correct operation of the A/D requires the use of two data registers and two control registers. The two data registers, a high byte data register known as ADRH, and a low byte data register known as ADRL, are the register locations where the digital value is placed after the completion of an analog to digital conversion cycle. Functions such as the A/D enable/disable, A/D channel selection and A/D clock frequency are determined using the two control registers, ADCR and ACSR. HT56RB688 TinyPowerTM A/D type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces Rev. 1.10 33 April 15, 2013 |
유사한 부품 번호 - HT56RB688_13 |
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유사한 설명 - HT56RB688_13 |
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