Standard Type Tm - Stm; Standard Tm Operation - Holtek HT66F20 Manual

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
Standard Type TM – STM
The Standard Type TM contains five operating modes, which are Compare Match Output, Timer/
Event Counter, Capture Input, Single Pulse Output and PWM Output modes. The Standard TM can
also be controlled with an external input pin and can drive two external output pins.
STM
HT66F20
HT66F30
HT66F40
HT66F50
HT66F60
f / 4 0 0 0
S Y S
f 0 0 1
S Y S
f / 1 6
0 1 0
H
f / 6 4 0 1 1
H
f 1 0 0
T B C
R e s e r v e d
1 0 1
1 1 0
T n O N
T C K n 1 1 1
T n P A U
T n C K 2 ~ T n C K 0

Standard TM Operation

There are two sizes of Standard TMs, one is 10-bits wide and the other is 16-bits wide. At the core is
a 10 or 16-bit count-up counter which is driven by a user selectable internal or external clock source.
There are also two internal comparators with the names, Comparator A and Comparator P. These
comparators will compare the value in the counter with CCRP and CCRA registers. The CCRP
comparator is 3 or 8-bits wide whose value is compared the with highest 3 or 8 bits in the counter
while the CCRA is the ten or sixteen bits and therefore compares all counter bits.
The only way of changing the value of the 10 or 16-bit counter using the application program, is
to clear the counter by changing the TnON bit from low to high. The counter will also be cleared
automatically by a counter overflow or a compare match with one of its associated comparators.
When these conditions occur, a TM interrupt signal will also usually be generated. The Standard
Type TM can operate in a number of different operational modes, can be driven by different clock
sources including an input pin and can also control an output pin. All operating setup conditions are
selected using relevant internal registers.
Rev. 2.50
Name TM No.
�0-bit STM �
— —
�6-bit STM 2
�6-bit STM 2
�6-bit STM 2
C C R P
C o m p a r a t o r P M a t c h
3 o r 8 - b i t C o m p a r a t o r P
b 7 ~ b 9 o r b 8 ~ b 1 5
C o u n t e r C l e a r
1 0 o r 1 6 - b i t C o u n t - u p C o u n t e r
T n C C L R
b 0 ~ b 9 o r
b 0 ~ b 1 5
C o m p a r a t o r A M a t c h
1 0 o r 1 6 - b i t
C o m p a r a t o r A
C C R A
Standard Type TM Block Diagram
�23
TM Input Pin TM Output Pin
TCK� TP�_0� TP�_�
—
TCK2 TP2_0� TP2_�
TCK2 TP2_0� TP2_�
TCK2 TP2_0� TP2_�
T n P F I n t e r r u p t
T n O C
O u t p u t P o l a r i t y
0
C o n t r o l C o n t r o l
1
T n P O L
T n M 1 , T n M 0
T n I O 1 , T n I O 0
T n A F I n t e r r u p t
T n I O 1 , T n I O 0
E d g e
D e t e c t o r
—
T P n _ 0
T P n P i n
I n p u t / O u t p u t
T P n _ 1
��ne 22� 20��