HTG2190 datasheet(16/50 Pages) HOLTEK

16 / 50 page

HTG2190

Rev. 1.20

July 5, 2002

SSL3

SSL2

SSL1

SSL0

Description

The Pad of common 0 is connected to common 0 signal and the Pad of

common 1 is connected to common 1 signal and so on.

The Pad of common 0 is connected to common 1 signal and the Pad of

common 1 is connected to common 2 signal and so on.

The Pad of common 0 is connected to common 2 signal and the Pad of

common 1 is connected to common 3 signal and so on.

The Pad of common 0 is connected to common 3 signal and the Pad of

common 1 is connected to common 4 signal and so on.

The Pad of common 0 is connected to common 4 signal and the Pad of

common 1 is connected to common 5 signal and so on.

The Pad of common 0 is connected to common 5 signal and the Pad of

common 1 is connected to common 6 signal and so on.

The Pad of common 0 is connected to common 6 signal and the Pad of

common 1 is connected to common 7 signal and so on.

The Pad of common 0 is connected to common 7 signal and the Pad of

common 1 is connected to common 0 signal and so on.

COMR register

Indirect addressing register

Locations 00H and 02H are indirect addressing regis-

ters that are not physically implemented. Any read/write

operation of [00H] and [02H] access data memory

pointed to by MP0 (01H) and MP1 (03H) respectively.

Reading location 00H or 02H indirectly returns the result

00H, while writing to it indirectly results in no operation.

The data movement function between two indirect ad-

dressing registers is not supported. The memory pointer

registers MP0 and MP1, are 8-bit registers used to ac-

cess the data memory by combining corresponding indi-

rect addressing registers, Bank1~Bank11, Bank14 and

Bank15 can use MP1 only.

Accumulator

The accumulator closely relates to ALU operations. It is

also mapped to location 05H of the data memory and is

the one which can operate with immediate data. The

data movement between two data memory must pass

through the accumulator.

Arithmetic and logic unit

- ALU

This circuit performs 8-bit arithmetic and logic operation.

The ALU provides the following functions:

· Arithmetic operations (ADD, ADC, SUB,

SBC, DAA)

· Logic operations (AND, OR, XOR, CPL)

· Rotation (RL, RR, RLC, RRC)

· Increment and Decrement (INC, DEC)

· Branch decision (SZ, SNZ, SIZ, SDZ ....)

The ALU not only saves the results of a data operation but

can also change the status register.

Status register

- STATUS

This 8-bit register (0AH) contains the zero flag (Z), carry

flag (C), auxiliary carry flag (AC), overflow flag (OV),

power down flag (PD) and Watchdog time-out flag (TO).

It also records the status information and controls the oper-

ation sequence.

With the exception of the TO and PD flags, bits in the

status register can be altered by instructions like any

other register. Any data written into the status register

will not change the TO or PD flags. In addition, opera-

tions related to the status register may give different re-

sults from those intended. The TO and PD flags can only

be changed by a system power up, Watchdog Timer

overflow, executing the HALT instruction and clearing

the Watchdog Timer.

The Z, OV, AC and C flags generally reflect the status of

the latest operations.

In addition, on entering the interrupt sequence or exe-

cuting the subroutine call, the status register will not be

pushed onto the stack automatically. If the contents of

the status register are important and the subroutine can

corrupt the status register, the programmer must take

precautions to save it properly.

Interrupt

The HTG2190 provides external and a PWM D/A inter-

rupt and internal timer/event counter interrupts. The in-

terrupt control register (INTC;0BH, INTCH;1EH) contains

the interrupt control bits to set the enable/disable and the

interrupt request flags.

HTG2190 Datasheet(PDF) 16 Page - Holtek Semiconductor Inc

HTG2190 Datasheet(HTML) 16 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

Datasheet Download

Link URL