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CHAPTER 3 CPU
Figure 3.7-7 Stack Operation Instruction and Dtack Pointer
Notes:
•
To set a value for the stack pointer, generally use an even-numbered address. If an odd-
numbered address is used, a word access is split into two parts, lowering efficiency.
•
The initial values of the USP register and SSP register after a reset are undefined.
■
System Stack Pointer (SSP)
To use the system stack pointer (SSP), set the S flag in the condition code register (CCR) of the processor
status (PS) to "1". The upper 8 bits of the address that will be used for the stack operation are indicated by
the system stack bank register (SSB).
■
User Stack Pointer (USP)
To use the user stack pointer (USP), set the S flag in the condition code register (CCR) of the processor
status (PS) to "0". The upper 8 bits of the address that will be used for the stack operation are indicated by
the user stack bank register (USB).
USP F328
H
XX
H
XX
H
C6F326
H
USB C6
H
AL A624
H
SSP 1234
H
SSB 56
H
S flag 0
Before execution
⇒
USP F326
H
A6
H
24
H
C6F326
H
USB C6
H
AL A624
H
SSP 1234
H
SSB 56
H
After execution
⇒
S flag 0
⇐
User stack is used
USP F328
H
XX
H
XX
H
561232
H
USB C6
H
AL A624
H
SSP 1234
H
SSB 56
H
S flag 1
Before execution
⇒
USP F328
H
A6
H
24
H
561232
H
USB C6
H
AL A624
H
SSP 1232
H
SSB 56
H
After execution
⇒
S flag 1
⇐
System stack is used
MSB
LSB
MSB
LSB
because S flag is "1"
because S flag is "0"
PUSHW A with the S flag set to "0"
PUSHW A with the S flag set to "1"
Summary of Contents for MB90460 Series
Page 1: ...The following document contains information on Cypress products ...
Page 3: ......
Page 5: ......
Page 9: ...iv ...
Page 41: ...22 CHAPTER 1 OVERVIEW ...
Page 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Page 83: ...64 CHAPTER 3 CPU ...
Page 95: ...76 CHAPTER 4 RESET ...
Page 107: ...88 CHAPTER 5 CLOCK ...
Page 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 175: ...156 CHAPTER 7 INTERRUPT ...
Page 181: ...162 CHAPTER 8 MODE SETTING ...
Page 223: ...204 CHAPTER 9 I O PORT ...
Page 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Page 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Page 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Page 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Page 485: ...466 CHAPTER 16 PWC Timer ...
Page 531: ...512 CHAPTER 17 UART ...
Page 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Page 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Page 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Page 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Page 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Page 715: ...696 APPENDIX ...
Page 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 739: ......