M16C Datasheet, PDF (18/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Mitsubishi microcomputers
Specifications in this manual are tentative and subject to change.
M16C / 6N Group
BCuPsUControl
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Central Processing Unit (CPU)
The CPU has a total of 13 registers shown in Figure 3-1. Seven of these registers (R0, R1, R2, R3, A0, A1,
and FB) come in two sets; therefore, these registers have two register banks.
b15
b8 b7
R0^(Note)
H
b0
L
b15
b8 b7
R1^(Note)
H
b0
L
b15
b0
R2^(Note)
Data
registers
b19
PC
b19
INTB H
b0
Program counter
b0
L
Interrupt table
register
b15
b0
R3^(Note)
b15
USP
b0
User stack pointer
b15
A0^(Note)
b15
A1^(Note)
b15
FB^(Note)
b0
Address
b0
registers
b0
Frame base
registers
b15
ISP
b15
SB
b15
FLG
b0
Interrupt stack
pointer
b0
Static base
register
b0
Flag register
IPL
U I OB S Z D C
Note: These registers consist of two register banks.
Figure 3-1. Central processing unit register
(1) Data registers (R0, R0H, R0L, R1, R1H, R1L, R2, and R3)
Data registers (R0, R1, R2, and R3) are configured with 16 bits, and are used primarily for transfer and
arithmetic/logic operations.
Registers R0 and R1 each can be used as separate 8-bit data registers, high-order bits as (R0H/R1H),
and low-order bits as (R0L/R1L). In some instructions, registers R2 and R0, as well as R3 and R1 can be
used as 32-bit data registers (R2R0/R3R1).
(2) Address rgisters (A0 and A1)
Address registers (A0 and A1) are configured with 16 bits, and have functions equivalent to those of data
registers. These registers can also be used for address register indirect addressing and address register
relative addressing.
In some instructions, registers A1 and A0 can be combined for use as a 32-bit address register (A1A0).
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