HT82B40A datasheet(8/54 Pages) HOLTEK

8 / 54 page

HT82B40R/HT82B40A

Rev. 1.70

November 5, 2014

· Rotation RRA, RR, RRCA, RRC, RLA, RL, RLCA,

RLC

· Increment and Decrement INCA, INC, DECA, DEC

· Branch decision, JMP, SZ, SZA, SNZ, SIZ, SDZ,

SIZA, SDZA, CALL, RET, RETI

Program Memory

The Program Memory is the location where the user code

or program is stored. The HT82B40R is a One-Time Pro-

grammable, OTP, memory type device where users can

program their application code into the device. By using

the appropriate programming tools, OTP devices offer

users the flexibility to freely develop their applications

which may be useful during debug or for products requir-

ing frequent upgrades or program changes. OTP devices

are also applicable for use in applications that require low

or medium volume production runs. The HT82B40A is a

Mask memory type device and offers the most cost effec-

tive solution for high volume products.

Structure

The Program Memory has a capacity of 4K by 15 bits.

The Program Memory is addressed by the Program

Counter and also contains data, table information and

interrupt entries. Table data, which can be setup in any

location within the Program Memory, is addressed by

separate table pointer registers.

Special Vectors

Within the Program Memory, certain locations are re-

served for special usage such as reset and interrupts.

· Location 000H

This area is reserved for program initialization. After

chip reset, the program always begins execution at lo-

cation 000H.

· Location 004H

This area is reserved for the USB interrupt service

program. If the USB interrupt is activated, the interrupt

is enabled and the stack is not full, the program jumps

to this location and begins execution.

· Location 008H

This area is reserved for the Timer/Event Counter 0 in-

terrupt service program. If a timer interrupt results

from a Timer/Event Counter 0 overflow, and if the in-

terrupt is enabled and the stack is not full, the program

jumps to this location and begins execution.

· Location 00CH

This area is reserved for the Timer/Event Counter 1 in-

terrupt service program. If a timer interrupt results

from a Timer/Event Counter 1 overflow, and the inter-

rupt is enabled and the stack is not full, the program

jumps to this location and begins execution.

· Table location

Any location in the program memory can be used as

look-up tables. There are three methods to read the

Program Memory data using two table read instruc-

tions:

²TABRDC² and ²TABRDL², transfer the con-

tents of the lower-order byte to the specified data

memory, and the higher-order byte to TBLH (08H).

The three methods are shown as follows:

¨ Using the instruction

²TABRDC [m]² for the current

Program Memory page, where one page=

256words, where the table location is defined by

TBLP in the current page. This is where the config-

uration option has disabled the TBHP register.

¨ Using the instruction

²TABRDC [m]², where the ta-

ble location is defined by registers TBLP and TBHP.

Here the configuration option has enabled the

TBHP register.

¨ Using the instruction

²TABRDL [m]², where the ta-

ble location is defined by registers TBLP in the last

page which has the address range 0F00H~0FFFH.

Only the destination of the lower-order byte in the ta-

ble is well-defined, the other bits of the table word are

transferred to the lower portion of TBLH, and the re-

maining 1-bit words are read as

²0². The Table

Higher-order byte register (TBLH) is read only. The ta-

ble pointers, TBLP and TBHP, are read/write regis-

ters, which indicate the table location. Before

accessing the the table, the locations must be placed

F F F H

1 5 b i t s

U S B

I n t e r r u p t V e c t o r

T i m e r / E v e n t 0 C o u n t e r

I n t e r r u p t V e c t o r

0 0 4 H

0 0 8 H

0 0 C H

I n i t i a l i s a t i o n

V e c t o r

0 0 0 H

T i m e r / E v e n t 1 C o u n t e r

I n t e r r u p t V e c t o r

Program Memory Structure

Instruction

Table Location Bits

b11

b10

TABRDC[m]

PC11

PC10

PC9

PC8

TABRDL [m]

1111

Table Location

Note:

PC11~PC8: Current Program Counter bits

TBHP register Bit 3 ~ Bit 0 when TBHP is enabled.

@7~@0: Table Pointer TBLP bits

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