Low Dropout Regulator - Ldo; Timer Modules - Tm; Introduction; Tm Operation - Holtek BS86DH12C Manual

BS86DH12C
High Voltage Touch A/D Flash MCU with HVIO
Low Dropout Regulator – LDO
The device includes an internal low dropout regulator, LDO. The LDO can reduce the higher input
voltage on the VCC1 pin, which ranges from 6V to 10V, to a stable 5V voltage and then output on
the VLDO pin. This 5V voltage can be used as a power for external or internal circuits.
VCC1
Timer Modules – TM
One of the most fundamental functions in any microcontroller device is the ability to control and
measure time. To implement time related functions the device includes several Timer Modules,
generally abbreviated to the name TM. The TMs are multi-purpose timing units and serve to provide
operations such as Timer/Counter, Input Capture, Compare Match Output and Single Pulse Output
as well as being the functional unit for the generation of PWM signals. Each of the TMs has two
interrupts. The addition of input and output pins for each TM ensures that users are provided with
timing units with a wide and flexible range of features.
The common features of the different TM types are described here with more detailed information
provided in the individual Compact and Periodic TM sections.

Introduction

The device contains several TMs and each individual TM can be categorised as a certain type,
namely Compact Type TM or Periodic Type TM. Although similar in nature, the different TM types
vary in their feature complexity. The common features to all of the Compact and Periodic TMs
will be described in this section and the detailed operation regarding each of the TM types will be
described in separate sections. The main features and differences between the two types of TMs are
summarised in the accompanying table.
Timer/Counter
Input Capture
Compare Match Output
PWM Output
Single Pulse Output
PWM Alignment
PWM Adjustment Period & Duty

TM Operation

The different types of TM offer a diverse range of functions, from simple timing operations to PWM
signal generation. The key to understanding how the TM operates is to see it in terms of a free
running count-up counter whose value is then compared with the value of pre-programmed internal
Rev. 1.00
DP
Reference
LDO Block Diagram
TM Function
Duty or Period
TM Function Summary
CTM0 CTM1
10-bit CTM 10-bit CTM
TM Name/Type Summary
77
LDO VDD/VLDO
HVSS
CTM PTM
√ √
— √
√ √
√ √
— √
Edge Edge
Duty or Period
PTM
10-bit PTM
October 26, 2018