Table 3-3 Initial Values of Registers
3.3 Data Formats
The H8/500 can process 1-bit data, 4-bit BCD data, 8-bit (byte) data, 16-bit (word) data, and 32-
bit (longword) data.
• Bit manipulation instructions operate on 1-bit data.
• Decimal arithmetic instructions operate on 4-bit BCD data.
• Almost all instructions operate on byte and word data.
• Multiply and divide instructions operate on longword data.
3.3.1 Data Formats in General Registers
Data of all the sizes above can be stored in general registers as shown in table 3-4.
Initial Value
Register Minimum Mode Maximum Mode
General registers
15 0 Undetermined Undetermined
R7 – R0
Control registers
15 0 Loaded from vector table Loaded from vector table
PC
SR
CCR
15 8 7 0 H'070x H'070x
T– – – – I2I1I0 – – – – NZVC (x: undetermined) (x: undetermined)
70
CP Undetermined Loaded from vector table
70
DP Undetermined Undetermined
70
EP Undetermined Undetermined
70
TP Undetermined Undetermined
70
BR Undetermined Undetermined
41
Downloaded from Elcodis.com electronic components distributor
To Next Page
Loading...
Need help?
General
