 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
HT46C46E Datasheet(PDF) 9 Page - Holtek Semiconductor Inc |
|
||||||||||||||||||||||||||||||
HT46C46E Datasheet(HTML) 9 Page - Holtek Semiconductor Inc |
|
|
9 / 45 page  HT46R46E/HT46C46E Rev. 1.30 9 July 19, 2005 stack. After a chip reset, the SP will point to the top of the stack. If the stack is full and a non-masked interrupt takes place, the interrupt request flag will be recorded but the acknowledgment will be inhibited. When the stack pointer is decremented (by RET or RETI), the interrupt will be serviced. This feature prevents stack overflow al- lowing the programmer to use the structure more easily. In a similar case, if the stack is full and a ²CALL² is sub- sequently executed, stack overflow occurs and the first entry will be lost (only the most recent 4 return ad- dresses are stored). Data Memory - RAM The data memory is designed with 84 ´8 bits. The data memory is divided into two functional groups: special function registers and general purpose data memory (64 ´8). Most are read/write, but some are read only. The special function registers include the indirect ad- dressing register (00H), timer/event counter (TMR;0DH), timer/event counter control register (TMRC;0EH), program counter lower-order byte regis- ter (PCL;06H), memory pointer register (MP;01H), ac- cumulator (ACC;05H), table pointer (TBLP;07H), table higher-order byte register (TBLH;08H), status register (STATUS;0AH), interrupt control register (INTC;0BH), PWM data register (PWM;1AH), the A/D result register (ADR;21H), the A/D control register (ADCR;22H), the A/D clock setting register (ACSR;23H), I/O registers (PA;12H, PB;14H, PD;18H) and I/O control registers (PAC;13H, PBC;15H, PDC;19H). The remaining space before the 40H is reserved for future expanded usage and reading these locations will get ²00H². The general purpose data memory, addressed from 40H to 7FH, is used for data and control information under instruction commands. All of the data memory areas can handle arithmetic, logic, increment, decrement and rotate operations di- rectly. Except for some dedicated bits, each bit in the data memory can be set and reset by ²SET [m].i² and ²CLR [m].i². They are also indirectly accessible through memory pointer register (MP;01H). Indirect Addressing Register Location 00H is an indirect addressing register that is not physically implemented. Any read/write operation of [00H] accesses data memory pointed to by MP (01H). Reading location 00H itself indirectly will return the re- sult 00H. Writing indirectly results in no operation. The memory pointer register MP (01H) is a 7-bit register. The bit 7 of MP is undefined and reading will return the result ²1². Any writing operation to MP will only transfer the lower 7-bit data to MP. Accumulator The accumulator is closely related to ALU operations. It is also mapped to location 05H of the data memory and can carry out immediate data operations. The data movement between two data memory locations must pass through the accumulator. Arithmetic and Logic Unit - ALU This circuit performs 8-bit arithmetic and logic opera- tions. 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 ....) S p e c i a l P u r p o s e D A T A M E M O R Y 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 I n d i r e c t A d d r e s s i n g R e g i s t e r M P A C C P C L T B L P T B L H S T A T U S I N T C T M R T M R C P A P A C P B P B C P D P D C P W M A D R A D C R A C S R : U n u s e d R e a d a s " 0 0 " 3 F H 2 4 H 2 0 H 2 1 H 2 2 H 2 3 H G e n e r a l P u r p o s e D A T A M E M O R Y ( 6 4 B y t e s ) 7 F H 4 0 H RAM Mapping |
Similar Part No. - HT46C46E |
|
Similar Description - HT46C46E |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
