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HT46RU67 Datasheet(PDF) 8 Page - Holtek Semiconductor Inc |
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HT46RU67 Datasheet(HTML) 8 Page - Holtek Semiconductor Inc |
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8 / 67 page  HT46RU67/HT46CU67 Rev. 1.10 8 May 27, 2010 Functional Description Execution Flow The system clock is derived from either a crystal or an RC oscillator or a 32768Hz crystal oscillator. It is inter- nally divided into four non-overlapping clocks. One in- struction cycle consists of four system clock cycles. Instruction fetching and execution are pipelined in such a way that a fetch takes one instruction cycle while de- coding and execution takes the next instruction cycle. The pipelining scheme allows each instruction to be ef- fectively executed in a cycle. If an instruction changes the value of the program counter, two cycles are re- quired to complete the instruction. Program Counter - PC The program counter is 15 bits wide and controls the se- quence in which the instructions stored in the program ROM are executed. The contents of the PC can specify a maximum of 32768 ´16 addresses. After accessing a program memory word to fetch an in- struction code, the value of the PC is incremented by 1. The PC then points to the memory word containing the next instruction code. When executing instructions requiring jumps to non-consecutive addresses such as a jump instruc- tion,a subroutine call, interrupt or reset, etc., the T 1 T 2 T 3 T 4 T 1 T 2 T 3 T 4 T 1 T 2 T 3 T 4 F e t c h I N S T ( P C ) E x e c u t e I N S T ( P C - 1 ) F e t c h I N S T ( P C + 1 ) E x e c u t e I N S T ( P C ) F e t c h I N S T ( P C + 2 ) E x e c u t e I N S T ( P C + 1 ) P C P C + 1 P C + 2 S y s t e m C l o c k O S C 2 ( R C o n l y ) P C Execution Flow Mode Program Counter *14 *13 *12 *11 *10 *9 *8 *7 *6 *5 *4 *3 *2 *1 *0 Initial Reset 000000000000000 External Interrupt 0 or A/D Converter Interrupt 000000000000100 External Interrupt 1 or Serial Interface Interrupt 000000000001000 Timer/Event Counter 0 Overflow 000000000001100 Timer/Event Counter 1 Overflow 000000000010000 UART Bus Interrupt or Serial Interface Interrupt 000000000010100 Multi-function Interrupt 000000000011000 Skip Program Counter + 2 (Within the current bank) Loading PCL *14 *13 *12 *11 *10 *9 *8 @7 @6 @5 @4 @3 @2 @1 @0 Jump, Call Branch BP.6 BP.5 #12 #11 #10 #9 #8 #7 #6 #5 #4 #3 #2 #1 #0 Return from Subroutine S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2 S1 S0 Program Counter Note: *14~*0: Program counter bits S14~S0: Stack register bits #12~#0: Instruction code bits @7~@0: PCL bits 1 3 1 2 8 7 0 P r o g r a m C o u n t e r B P . 5 B a n k P o i n t e r ( B P ) B P . 6 1 4 |
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