2. Programming Model

Rev.1.00 Jan. 10, 2008 Page 29 of 1658

REJ09B0261-0100

31 0
R0_BANK0*1,*2
R1_BANK0*2
R2_BANK0*2
R3_BANK0*2
R4_BANK0*2
R5_BANK0*2
R6_BANK0*2
R7_BANK0*2
R8
R9
R10
R11
R12
R13
R14
R15
SR
GBR
MACH
MACL
PR
PC

(a) Register configuration

in user mode

31 0
R0_BANK1*1,*3
R1_BANK1*3
R2_BANK1*3
R3_BANK1*3
R4_BANK1*3
R5_BANK1*3
R6_BANK1*3
R7_BANK1*3
R8
R9
R10
R11
R12
R13
R14
R15
R0_BANK0*1,*4
R1_BANK0*4
R2_BANK0*4
R3_BANK0*4
R4_BANK0*4
R5_BANK0*4
R6_BANK0*4
R7_BANK0*4

(b) Register configuration in

privileged mode (RB = 1)

GBR
MACH
MACL
VBR
PR
SR
SSR
PC
SPC
31 0
R0_BANK1*1,*3
R1_BANK1*3
R2_BANK1*3
R3_BANK1*3
R4_BANK1*3
R5_BANK1*3
R6_BANK1*3
R7_BANK1*3
R8
R9
R10
R11
R12
R13
R14
R15
R0_BANK0*1,*4
R1_BANK0*4
R2_BANK0*4
R3_BANK0*4
R4_BANK0*4
R5_BANK0*4
R6_BANK0*4
R7_BANK0*4

(c) Register configuration in

privileged mode (RB = 0)

GBR
MACH
MACL
VBR
PR
SR
SSR
PC
SPC
SGR
DBR
SGR
DBR

R0 is used as the index register in indexed register-indirect addressing mode and

indexed GBR indirect addressing mode.

Banked registers
Banked registers

Accessed as general registers when the RB bit is set to 1 in SR. Accessed only by

LDC/STC instructions when the RB bit is cleared to 0.

Banked registers

Accessed as general registers when the RB bit is cleared to 0 in SR. Accessed only

by LDC/STC instructions when the RB bit is set to 1.

Notes: 1.

2.

3.

4.

Figure 2.2 CPU Register Configuration in Each Processing Mode