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2.4.5
Initial Register Values
Reset exception handling loads the CPU's program counter (PC) from the vector table, clears the
trace bit in EXR to 0, and sets the interrupt mask bits in CCR and EXR to 1. The other CCR bits
and the general registers are not initialized. In particular, the stack pointer (ER7) is not initialized.
The stack pointer should therefore be initialized by an MOV.L instruction executed immediately
after a reset.
2.5
Data Formats
The H8S/2000 CPU can process 1-bit, 4-bit (BCD), 8-bit (byte), 16-bit (word), and 32-bit
(longword) data. Bit-manipulation instructions operate on 1-bit data by accessing bit n (n = 0, 1, 2,
…, 7) of byte operand data. The DAA and DAS decimal-adjust instructions treat byte data as two
digits of 4-bit BCD data.
2.5.1
General Register Data Formats
Figure 2.9 shows the data formats in general registers.
7
0
7
0
MSB
LSB
MSB
LSB
7
0
4 3
Don't care
Don't care
Don't care
7
0
4 3
7
0
Don't care
6 5 4 3 2
7
1 0
7
0
Don't care
6 5 4 3 2
7
1 0
Don't care
RnH
RnL
RnH
RnL
RnH
RnL
Data Type
Register Number
Data Image
Byte data
Byte data
4-bit BCD data
4-bit BCD data
1-bit data
1-bit data
Upper
Lower
Upper
Lower
Figure 2.9 General Register Data Formats (1)
Содержание H8S/2215 Series
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Страница 721: ...Rev 3 0 10 02 page 663 of 686 ø A23 to A0 to tBRQS tBACD tBZD tBACD tBZD tBRQS Figure 24 11 External Bus Release Timing ...
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