MAXQ612/MAXQ622 User’s Guide
Maxim Integrated 4-17
REGISTER DESCRIPTION
GRS, 0Eh[08h]
General Register Byte-Swapped (16 bits)
Initialization This register is cleared to 0000h on all forms of reset
Access Unrestricted read-only access.
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.
GRH, 0Eh[09h]
General Register High Byte (8 bits)
Initialization This register is cleared to 00h on all forms of reset.
Access Unrestricted direct read/write access.
GRH.7 to GRH.0 This register reflects the high byte of the GR register and is intended primarily for support-
ing byte operations on 16-bit data. Any data written to the GRH register is also stored in
the high byte of the GR register.
GRXL, 0Eh[0Ah]
General Register Sign Extended Low Byte (16 bits)
Initialization This register is cleared to 0000h on all forms of reset.
Access Unrestricted direct read-only access.
GRXL.15 to GRXL.0 This register provides the sign extended low byte of GR as a 16-bit source.
FP, 0Eh[0Bh]
Frame Pointer Register (16 bits)
Initialization This register is cleared to 0000h on all forms of reset.
Access Unrestricted direct read-only access.
FP.15 to FP.0 This register provides the current value of the frame pointer (BP[OFFS]).
DP[0], 0Fh[03h]
Data Pointer 0 Register (16 bits)
Initialization This register is cleared to 0000h on all forms of reset.
Access Unrestricted direct read/write access.
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 incre-
mented or decremented before each write operation.
DP[1], 0Fh[07h]
Data Pointer 1 Register (16 bits)
Initialization This register is cleared to 0000h on all forms of reset.
Access Unrestricted direct read/write access.
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 incre-
mented or decremented before each write operation.
CP, 0Fh[0Bh]
Code Pointer Address Register (16 bits)
Initialization This register is cleared to 0000h on all forms of reset.
Access Unrestricted direct read/write access.
CP.15 to CP.0 This register is used as a pointer to access program code memory. CP can be automati-
cally incremented or decremented following each read operation.
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