Owner manual

DS4830 User’s Guide
223
25.3.1 – UROM_moveDP0
Function
UROM_moveDP0
Summary
Reads the byte/word value pointed to by DP[0].
Inputs
DP[0]: Address to read from data space (include 8000h offset if reading from flash).
Outputs
GR: Data byte/word read.
Destroys
None
Notes:
 Before calling this function, DPC should be set appropriately to configure DP[0] for byte or word mode.
 The address passed to this function should be based on the data memory mapping for the utility ROM, as shown
in Figure 25-1. When a byte mode address is used, CDA0 must be set appropriately to access either the upper or
lower half of program flash memory.
 This function automatically selects DP[0] as the data pointer before reading the byte/word value.
 Implemented as: move GR, @DP[0]
25.3.2 – UROM_moveDP0inc
Function
UROM_moveDP0inc
Summary
Reads the byte/word value pointed to by DP[0], then increments DP[0].
Inputs
DP[0]: Address to read from data space (include 8000h offset if reading from flash).
Outputs
GR: Data byte/word read.
DP[0] is incremented.
Destroys
None
Notes:
 Before calling this function, DPC should be set appropriately to configure DP[0] for byte or word mode.
 The address passed to this function should be based on the data memory mapping for the utility ROM, as shown
in Figure 25-1. When a byte mode address is used, CDA0 must be set appropriately to access either the upper or
lower half of program flash memory.
 This function automatically selects DP[0] as the data pointer before reading the byte/word value.
 Implemented as: move GR, @DP[0]++
25.3.3 – UROM_moveDP0dec
Function
UROM_moveDP0dec
Summary
Reads the byte/word value pointed to by DP[0], then decrements DP[0].
Inputs
DP[0]: Address to read from data space (include 8000h offset if reading from flash).
Outputs
GR: Data byte/word read.
DP[0] is decremented.
Destroys
None
Notes:
 Before calling this function, DPC should be set appropriately to configure DP[0] for byte or word mode.
 The address passed to this function should be based on the data memory mapping for the utility ROM, as shown
in Figure 25-1. When a byte mode address is used, CDA0 must be set appropriately to access either the upper or
lower half of program flash memory.
 This function automatically selects DP[0] as the data pointer before reading the byte/word value.
 Implemented as: move GR, @DP[0]--