IBM EM78M611E manual Data Memory, Special Purpose Register

Page 13

EM78M611E

Universal Serial Bus Series Microcontroller

8.2 Data Memory

The Data Memory has 144 bytes SRAM space. It has also an on-chip USB Application FIFO space for USB Application. Figure 8-1 (next page) shows the organization of the Data Memory Space.

8.2.1 Special Purpose Register

When the microcontroller executes instructions, specific registers are implemented to ensure proper operation of essential functions such as Status Register which records the calculation status, Port I/O Control Registers which control the I/O pins’ direction, etc. Lots of other special purpose registers are provided for various functions.

Note that Special Control Registers can only be read or written to by two instructions: IOR and IOW.





	!"#
	1 6x8((*1/'-+,/C$-))&%o.m0m)on
>!	R eg is ter

3234

'5637635#

>!(A(A#"#(:?:?@3??&%6!/#$$<<:


	-.0*0		'
	*		1FGDHA=I'(*)0A)=B!63)0A635DE=C1=

>/ 63;<#6%=89:463;<#6%=89:4!6&;<#6%=!8,:4:463;<#6%==893:4:4

Fig. 8-1 Data RAM Organization of EM7 M 11E

Product Specification (V1.11) 04.20.2007

• 9

(This specification is subject to change without further notice)

Image 13

Contents EM78M611E Trademark Acknowledgments 2.1 Appendix Product Specification V1.1General Description FeaturesUniversal Serial Bus Series Microcontroller Product Specification V1.1 Application Type DefinitionOriginal With Both VNN Pin AssignmentEM78M611EXBP/BM/DM 20-Pin DIP/SOP/SSOP Pin Description Symbol FunctionALU ACC Data & Control BUS Block DiagramProgram Memory Function DescriptionSpecial Purpose Register Data Memory2.3 R2 Program Counter & Stack Default Value 0B00000000 2.2 R1 Timer / Clock Counter Default Value 0B00000000Operation Registers R3 0 Carry/Borrow Flag 2.4 R3 Status Register Default Value0B00011XXXBit Program Memory Page Address Condition2.5 R4 RAM Select Register Default Value 0B00XXXXXX EP0Busy Stall RF Interrupt Status Register Default Value 0B00000000Accumulator Control RegistersTCC Rate WDT Rate Control Register Default Value 0B00111111PS/2 Operation ModeBit P96 P95 P94 P93 P92 P91 P90 DualFrq.1 DualFrq.0 FrequencyPH95 PH93 PU8 PU6 PU5 USB Application FIFOs Extra Control RegisterUSB Device Controller USB ApplicationSaving Power Mode ResetInterrupt Dual Clock ModeFunction Description Pattern Detect Application PDASampling Rate and Debounce Length Control RegisterSR.2 SR.1 SR.0 Sampling Rate DB.2 DB.1 DB.0 Debounce TimePulse Width Modulation PWM Erepwm Control Register Default Value 0B00000001Duty Cycle R10 PWM1 Duty Cycle RegisterAnalog-To-Digital Converter ADC ERA AD Channel Select Register Default Value 0B00011111Clock Hz Period/255 s Channel Port ERB AD LSB Data Register Default Value 0B00000000ERD AD Control Register Default Value 0B00000000 ERC AD MSB Data Register Default Value 0B00000000Command Value Action Execution Time Symbol Min Max Unit DC Electrical CharacteristicSymbol Parameter Condition Min Type Max Unit Absolute Maximum RatingsUSB Interface Application Circuit Special Register Map Address Name Bit Bit1 Default ValueOperation Registers Extra Register IOCA3 = Address Name Bit Default ValueBinary Instruction Hex Mnemonic Operation Status Affected Instruction SetThis instruction is not recommended for RE, RF operation Address Code Option Register11 16ms Bits 4~12 User ID Address EM78M611E