HT56RB688_13 datasheet(33/164 Pages) HOLTEK

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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

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

April 15, 2013

HT56RB688 Datasheet(PDF) 33 Page - Holtek Semiconductor Inc

HT56RB688 Datasheet(HTML) 33 Page - Holtek Semiconductor Inc

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