Maxim Integrated MAXQ Family - Manual (Page 56)

4-10
MAXQ Family User’s Guide
4.23 General Register Byte-Swapped (GRS, Eh[8h])
Initialization: This register is cleared to 0000h on all forms of reset
Access: Unrestricted read-only access.
4.24 General Register High Byte (GRH, Eh[9h])
Initialization: This register is cleared to 00h on all forms of reset.
Access: Unrestricted direct read/write access.
4.25 General Register Sign Extended Low Byte (GRXL, Eh[Ah])
Initialization: This register is cleared to 0000h on all forms of reset.
Access: Unrestricted direct read-only access.
4.26 Frame Pointer Register (FP, Eh[Bh])
Initialization: This register is cleared to 0000h on all forms of reset.
Access" Unrestricted direct read-only access.
4.27 Data Pointer 0 Register (DP[0], Fh[3h])
Initialization: This register is cleared to 0000h on all forms of reset.
Access: Unrestricted direct read/write access.
4.28 Data Pointer 1 Register (DP[1], Fh[7h])
Initialization: This register is cleared to 0000h on all forms of reset.
Access: Unrestricted direct read/write access.
BIT FUNCTION
GRS.15 to GRS.0
This register is intended primarily for supporting byte operations on 16-bit data. This 16-bit read only register returns the byte-
swapped value for the data contained in the GR register.
BIT FUNCTION
GRH.7 to GRH.0
This register reflects the high byte of the GR register and is intended primarily for supporting byte operations on 16-bit data.
Any data written to the GRH register will also be stored in the high byte of the GR register.
BIT FUNCTION
GRXL.15 to GRXL.0 This register provides the sign extended low byte of GR as a 16-bit source.
BIT FUNCTION
FP.15 to FP.0 This register provides the current value of the frame pointer (BP[Offs]).
BIT FUNCTION
DP[0].15 to DP[0].0
This register is used as a pointer to access data memory. DP[0] can be automatically incremented or decremented following
each read operation or can be automatically incremented or decremented before each write operation.
BIT FUNCTION
DP[1].15 to DP[1].0
This register is used as a pointer to access data memory. DP[1] can be automatically incremented or decremented following
each read operation or can be automatically incremented or decremented before each write operation.
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