HD6432646 Hitachi, HD6432646 Datasheet - Page 74
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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Some instructions leave some or all of the flag bits unchanged. For the action of each instruction
on the flag bits, refer to Appendix A.1, Instruction List.
Operations can be performed on the CCR bits by the LDC, STC, ANDC, ORC, and XORC
instructions. The N, Z, V, and C flags are used as branching conditions for conditional branch
(Bcc) instructions.
(4) Multiply-Accumulate Register (MAC): This 64-bit register stores the results of multiply-
and-accumulate operations. It consists of two 32-bit registers denoted MACH and MACL. The
lower 10 bits of MACH are valid; the upper bits are a sign extension.
2.4.4
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.
40
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