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CHAPTER 3 CPU
3.4.2
Address Specification by Bank Addressing
In address specification by bank addressing, the 16-Mbyte memory space is divided
into 256 64-Kbyte banks. A bank address that corresponds to each space is specified
in the bank register to determine the upper 8 bits of the address. The lower 16 bits of
the address are specified by the instruction.
The five types of bank registers classified by function are as follows:
• Program bank register (PCB)
• Data bank register (DTB)
• User stack bank register (USB)
• System stack bank register (SSB)
• Additional bank register (ADB)
■
Bank Registers and Access Space
Table 3.4-1 lists the access space and main function of each bank register.
Table 3.4-1 Access Space and Main Function of Each Bank Register
Bank register
name
Access space
Main function
Initial value
after a reset
Program bank
register (PCB)
Program (PC) space
Instruction codes, vector tables and immediate-value data
are stored.
FF
H
Data bank register
(DTB)
Data (DT) space
Read/write data is stored. Internal or external peripheral
control registers and data registers are accessed.
00
H
User stack bank
register (USB)
Stack (SP) space
This area is used for stack accesses such as when PUSH/
POP instructions and interrupt registers are saved. The SSB
is used when the stack flag in the condition register (CCR:
S) is "1". The USB is used when the stack flag in the
condition register (CCR: S) is "0". *
00
H
System stack bank
register (SSB) *1
00
H
Additional bank
register (ADB)
Additional (AD)
space
Data that overflows from the data (DT) space is stored.
00
H
* : The SSB is always used as an interrupt stack.
Содержание MB90460 Series
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Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Страница 715: ...696 APPENDIX ...
Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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