Maxim-integrated MAXQ7667 Uživatelský manuál stáhnout pdf (Strana 210)

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MAXQ7667 User’s Guide

12.3.2 Breakpoint Registers

The MAXQ7667 incorporates six host-configurable breakpoint registers (BP0–BP5) for establishing different types of breakpoint mech-

anisms. The first four breakpoint registers (BP0–BP3) are 16-bit registers that are configurable as program memory address break-

points. When enabled, the debug engine forces a break when a match between the breakpoint register and the program memory exe-

cution address occurs. The final two 16-bit breakpoint registers (BP4 and BP5) are configurable in one of two ways. They can be con-

figured as data memory address breakpoints or can be configured to support register-access breakpoints. In either case, if break-

points are enabled and the defined breakpoint match occurs, the debug engine generates a break condition. The six breakpoint reg-

isters are detailed in the following sections.

12.3.2.1 Breakpoint Registers 0 to 3 (BP0 to BP3)

The BP0 to BP3 registers are accessible only via background mode read/write debug commands. These four registers serve as pro-

gram memory address breakpoints. When the DME bit is set, the debug engine monitors the program address bus activity while the

CPU is executing the user program. A break occurs when the address pattern matches with the contents of these registers, allowing

the debug engine to take control of the CPU and enter debug mode.

These registers default to FFFFh after a power-on reset or test-logic-reset TAP state.

Breakpoint Register x (where x = 0, 1, 2, 3)

Bits 15 to 0: Breakpoint Register x Bits 15:0 (BPx[15:0])

Bit #

15 14 13 12 11 10 98

Name BPx15 BPx14 BPx13 BPx12 BPx11 BPx10 BPx9 BPx8

Reset 1 1 1 1 1 1 1 1

Access s s s s s s s s

Bit #

76543210

Name BPx7 BPx6 BPx5 BPx4 BPx3 BPx2 BPx1 BPx0

Reset 1 1 1 1 1 1 1 1

Access s s s s s s s s

s = special (accessible only by background mode read/write commands)

1 2 ... 205 206 207 208 209 210 211 212 213 214 215 ... 346 347

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Maxim-integrated MAXQ7667 Uživatelský manuál Strana 210