20.6.3
Examples of Stopping and Restarting the User Break Controller
The following are example programs:
; Transition to user break controller stopped state
; (1) Initialize BBRA and BBRB to 0.
mov
#0, R0
mov.l
mov.w
mov.l
mov.w
#BBRA, R1
R0, @R1
#BBRB, R1
R0, @R1
; (2) Initialize BRCR to 0.
mov.l
mov.w
#BRCR, R1
R0, @R1
; (3) Dummy read BRCR.
mov.w @R1, R0
; (4) Read STBCR2, then set MSTP5 bit in the read data to 1 and write
it back
mov.l
mov.b
#STBCR2, R1
@R1, R0
or #H’1, R0
mov.b
R0, @R1
; (5) Twice dummy read STBCR2.
mov.b
mov.b
@R1, R0
@R1, R0
; Canceling user break controller stopped state
; (6) Read STBCR2, then clear MSTP5 bit in the read data to 0 and write
it back
mov.l
mov.b
and
#STBCR2, R1
@R1, R0
#H’FE, R0
R0, @R1
mov.b
; (7) Twice dummy read STBCR2.
mov.b
mov.b
@R1, R0
@R1, R0
Rev. 6.0, 07/02, page 798 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
