HT46R14-28 Просмотр технического описания (PDF) - Holtek Semiconductor

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HT46R14-28

A/D Type 8-Bit OTP MCU

Holtek Semiconductor 

HT46R14

Mode

Initial Reset

External Interrupt 0

External Interrupt 1

Comparator 0 interrupt

Timer/Event Counter 0 Overflow

Timer/Event Counter 1 Overflow

A/D Converter Interrupt

Skip

Loading PCL

Jump, Call Branch

Return from Subroutine

*11 *10 *9

000

000

000

000

000

000

000

*11 *10 *9

#11 #10 #9

S11 S10 S9

Program Counter

*8 *7 *6 *5 *4 *3 *2 *1 *0

000000000

000000100

000001000

000001100

000010000

000010100

000011000

Program Counter+2

*8 @7 @6 @5 @4 @3 @2 @1 @0

#8 #7 #6 #5 #4 #3 #2 #1 #0

S8 S7 S6 S5 S4 S3 S2 S1 S0

Note: *11~*0: Program counter bits

#11~#0: Instruction code bits

Program Counter

S11~S0: Stack register bits

@7~@0: PCL bits

The conditional skip is activated by instructions. Once

the condition is met, the next instruction, fetched during

the current instruction execution, is discarded and a

dummy cycle replaces it to get the proper instruction.

Otherwise proceed with the next instruction.

The lower byte of the program counter (PCL) is a read-

able and writeable register (06H). Moving data into the

PCL performs a short jump. The destination will be

within 256 locations. When a control transfer takes

place, an additional dummy cycle is required.

Program memory - ROM

The program memory is used to store the program in-

structions which are to be executed. It also contains

data, table, and interrupt entries, and is organized into

4096´15 bits, addressed by the program counter and ta-

ble pointer.

Certain locations in the program memory are reserved

for special usage:

· Location 000H

Location 000H is reserved for program initialization.

After chip reset, the program always begins execution

at location 000H.

· Location 004H

Location 004H is reserved for the external interrupt 0

service program. If the INT0 input pin is activated, the

interrupt is enabled and the stack is not full, the pro-

gram begins execution at location 004H.

· Location 008H

Location 008H is reserved for the external Interrupt 1

service program. If the INT1 input pin is activated, the

interrupt is enabled and the stack is not full, the pro-

gram begins execution at location 008H.

· Location 00CH

Location 00CH is reserved for the Comparator 0 inter-

rupt service program. If the Comparator 0 output pin is

activated, and if the interrupt is enable and the stack is

not full, the program begins execution at location

00CH.

· Location 010H

Location 010H is reserved for the Timer/Event Coun-

ter 0 interrupt service program. If a timer interrupt re-

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

interrupt is enabled and the stack is not full, the pro-

gram begins execution at location 010H.

· Location 014H

Location 014H is reserved for the Timer/Event Coun-

ter 1 interrupt service program. If a timer interrupt re-

sults from a Timer/Event Counter 1 overflow, and if the

interrupt is enabled and the stack is not full, the pro-

gram begins execution at location 014H.

· Location 018H

Location 018H is reserved for the A/D converter inter-

rupt service program. If an A/D converter interrupt re-

sults from an end of A/D conversion, and if the

interrupt is enabled and the stack is not full, the pro-

gram begins execution at location 018H.

· Table location

Any location in the PROM space can be used as

look-up tables. The instructions ²TABRDC [m]² (the

current page, 1 page=256 words) and ²TABRDL [m]²

(the last page) transfer the contents of the lower-order

byte to the specified data memory, and the

higher-order byte to TBLH (08H). Only the destination

of the lower-order byte in the table is well-defined, the

other bits of the table word are transferred to the lower

portion of TBLH, and the remaining 1 bit is read as ²0².

Rev. 1.00

6

November 1, 2005

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