HT56RB688_13 datasheet(34/164 Pages) HOLTEK

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Serial Interface Module Registers

The device contains two Serial Interface Modules named SIM0 and SIM1 and each SIM contains an

SPI and an I

2C interface. The SIMxCTL0, SIMxCTL1, SIMxCTL2 and SIMxAR are the control

registers for the Serial Interface function while the SIMxDR is the data register for the Serial Interface

Data where x means 0 and 1.

Port A Wake-up Register - PAWU

All pins on Port A have a wake-up function enable a low going edge on these pins to wake-up the

device when it is in a power down mode. The pins on Port A that are used to have a wake-up function

are selected using this resister.

Pull-High Registers - PAPU, PBPU, PCPU, PDPU, PEPU, PFPU

All I/O pins on Ports PA, PB, PC, PE, PE and PF if setup as inputs, can be connected to an internal

pull-high resistor. The pins which require a pull-high resistor to be connected are selected using these

registers.

Clock Control Register - CLKMOD

The device operates using a dual clock system whose mode is controlled using this register. The

slow clock.

LCD/LED Registers - LCDCTRL, LEDCTRL, LCDIO

The device contains a fully integrated LCD/LED Driver function which can be setup in various

configurations allowing it to control a wide range of external LCD and LED panels. Most of these

options are controlled using the LCDCTRL and LECTRL registers. As some of the LCD segment

driving pins, which are pin-shared with I/O pins, can also be setup to be used as general I/O pins, the

Miscellaneous Register - MISC0, MISC1

These registers name MISC0 and MISC1 are used to control the miscellaneous functions such as the

active edge selection of the external interrupt pins, the clock divided ratio selection of the Smart Card

and the Watchdog Timer enable control bits. There are also four bits used to determine if the output

type is open drain or CMOS output for PA0~PA3.

Input/Output Ports

Holtek microcontroller offer considerable flexibility on their I/O ports. With the input or output

designation of every pin fully under user program control, pull-high selections for all ports and

wake-up selections on certain pins, the user is provided with an I/O structure to meet the needs of a

wide range of application possibilities.

The device provides up to 48 bidirectional input/output lines labeled with port names PA, PB, PC, PD,

PE and PF. These I/O ports are mapped to the RAM Data Memory with specific addresses as shown in

the Special Purpose Data Memory table. All of these I/O ports can be used for input and output

operations. For input operation, these ports are non-latching, which means the inputs must be ready at

the T2 rising edge of instruction ²MOV A,[m]², where m denotes the port address. For output

operation, all the data is latched and remains unchanged until the output latch is rewritten.

Rev. 1.10

April 15, 2013

HT56RB688

TinyPowerTM A/D type Smart Card OTP MCU

with LCD, DAC, ISO 7816 and USB Interfaces

HT56RB688 Datasheet(PDF) 34 Page - Holtek Semiconductor Inc

HT56RB688 Datasheet(HTML) 34 Page - Holtek Semiconductor Inc

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