HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 54
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HD6417615
Manufacturer Part Number
HD6417615
Description
Hardware Manual
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6417615.pdf
(873 pages)
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There are dedicated load/store instructions for accessing the RS, RE and MOD registers. For
example, the RS register is accessed as follows.
The following instructions set addresses in the RS, RE registers for zero overhead repeat control:
The GBR register and VBR register are the same as the previous SuperH microprocessor registers.
An RC counter and four control bits (DMX bit, DMY bit, RF1 bit, RF0 bit) have been added to
the SR register. The RS, RE and MOD registers are new registers.
2.1.3
System registers consist of four 32-bit registers: high and low multiply and accumulate registers
(MACH and MACL), the procedure register (PR), and the program counter (PC). The MACH and
MACL store the results of multiplication or multiply and accumulate operations*. The PR stores
the return address from the subroutine procedure. The PC indicates the address of the program in
execution; it controls the flow of the processing. The PC indicates the fourth byte after the
instruction currently being executed. These registers are the same as those in the SuperH
microprocessor.
Note: These are used only when executing an instruction that was supported by SH-1 and SH-2.
36
LDC
LDC.L
STC
STC.L
LDRS
LDRE
They are not used for newly added multiplication instructions (PMULS).
System Registers
Rm,RS;
@Rm+,RS;
RS,Rn;
RS,@-Rn;
@(disp,PC);
@(disp,PC);
31
31
31
Figure 2.3 System Register Configuration
Rm RS
(Rm) RS,Rm+4 Rm
RS Rn
Rn-4 Rn,RS (Rn)
disp 2 + PC RS
disp 2 + PC RE
MACH
MACL
PR
PC
0
0
0
Multiply and accumulate
register high (MACH)
Multiply and accumulate
register low (MACL)
Procedure register (PR)
Program counter (PC)
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