HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 78

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

2.4.5
The program counter (PC) among CPU internal registers is initialized when reset exception
handling loads a start address from a vector table. The trace (T) bit in EXR is cleared to 0, and the
interrupt mask (I) bits in CCR and EXR are set to 1. The other CCR bits and the general registers
are not initialized. Note that the stack pointer (ER7) is undefined. The stack pointer should
therefore be initialized by an MOV.L instruction executed immediately after a reset.
2.5
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
Figure 2.9 shows the data formats of general registers.
Rev. 2.0, 08/02, page 38 of 788
Initial Register Values
Data Formats
General Register Data Formats
Data Type
1-bit data
1-bit data
4-bit BCD data
4-bit BCD data
Byte data
Byte data
Figure 2.9 General Register Data Formats (1)
Register Number
RnH
RnL
RnH
RnL
RnH
RnL
MSB
Data Image
7
7
7
7
Upper
6 5 4 3 2
Don't care
Don't care
Don't care
4 3
Lower
1 0
LSB
0
0
0
MSB
7
7
7
7
Upper
6 5 4 3 2
Don't care
Don't care
Don't care
4 3
Lower
1 0
LSB
0
0
0