HT83F40P datasheet(12/61 Pages) HOLTEK

12 / 61 page

HT83FXX

Rev. 1.00

May 12, 2009

Special Function Registers

To ensure successful operation of the microcontroller,

certain internal registers are implemented in the RAM

Data Memory area. These registers ensure correct op-

eration of internal functions such as timers, interrupts,

watchdog, etc., as well as external functions such as I/O

data control. The location of these registers within the

RAM Data Memory begins at the address

²00H². Any

unused Data Memory locations between these special

function registers and the point where the General Pur-

pose Memory begins is reserved for future expansion

purposes, attempting to read data from these locations

will return a value of

²00H².

Indirect Addressing Register

- IAR

The Indirect Addressing Register, IAR, although having

location in normal RAM register space, do not actually

physically exist as normal registers.

The method of indirect addressing for RAM data manip-

ulation uses the Indirect Addressing Register and Mem-

ory Pointer, in contrast to direct memory addressing,

where the actual memory address is specified.

Actions on the IAR register will result in no actual read or

write operation to these register but rather to the mem-

ory location specified by their corresponding Memory

Pointer, MP. Acting as a pair, IAR and MP can together

only access data. As the Indirect Addressing Registers

are not physically implemented, reading the Indirect Ad-

dressing Register indirectly will return a result of

²00H²

and writing to the registers indirectly will result in no op-

eration.

Memory Pointer

- MP

For all devices, Memory Pointer, known as MP is pro-

vided. These Memory Pointers are physically imple-

mented in the Data Memory and can be manipulated in

the same way as normal register providing a convenient

way with which to address and track data. When any op-

eration to the relevant Indirect Addressing Registers is

carried out, the actual address that the microcontroller is

directed to, is the address specified by the related Mem-

ory Pointer. MP, together with Indirect Addressing Reg-

ister, IAR, are used to access data. Note that bit 7 of the

Memory Pointers is not required to address the full

memory space and will return a value of

²1² if read.

0 0 H

0 1 H

0 2 H

0 3 H

0 4 H

0 5 H

0 6 H

0 7 H

0 8 H

0 9 H

0 A H

0 B H

0 C H

0 D H

0 E H

0 F H

1 0 H

1 1 H

1 2 H

1 3 H

1 4 H

1 5 H

1 6 H

1 7 H

1 8 H

1 9 H

1 A H

1 B H

1 C H

1 D H

1 E H

1 F H

2 0 H

2 1 H

2 2 H

2 3 H

2 4 H

2 5 H

2 6 H

2 7 H

2 8 H

2 9 H

2 A H

2 B H

2 C H

2 D H

2 E H

2 F H

: U n k n o w n

I A R

M P

A C C

P C L

T B L P

T B L H

W D T S

S T A T U S

I N T C

T M R 0

T M R 0 C

T M R 1

T M R 1 C

P A

P A C

P B

P B C

I N T C H

S I M C 0

S I M C 1

S I M D R

S I M A R / S I M C 2

D A L

D A H

P W M C R

P W M L

P W M H

V O L

Special Purpose Data Memory Structure

HT83F40P 数据表(PDF) 12 Page - Holtek Semiconductor Inc

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