
S i M 3 L 1 x x
52
Rev 1.1
4.10. Security
The peripherals on the SiM3L1xx devices have a register lock and key mechanism that prevents undesired
accesses of the peripherals from firmware. Each bit in the PERIPHLOCKx registers controls a set of peripherals. A
key sequence must be written to the KEY register to modify bits in PERIPHLOCKx. Any subsequent write to KEY
will then inhibit accesses of PERIPHLOCKx until it is unlocked again through KEY. Reading the KEY register
indicates the current status of the PERIPHLOCKx lock state.
If a peripheral’s registers are locked, all writes will be ignored. The registers can be read, regardless of the
peripheral’s lock state.
Figure
4.5.
SiM3L1xx Security Block Diagram
4.11. On-Chip Debugging
The SiM3L1xx devices include JTAG and Serial Wire programming and debugging interfaces and ETM for
instruction trace. The JTAG interface is supported on SiM3L1x7 devices only, and does not include boundary scan
capabilites. The ETM interface is supported on SiM3L1x7, and SiM3L1x6 devices only. The JTAG and ETM
interfaces can be optionally enabled to provide more visibility while debugging at the cost of using several Port I/O
pins. Additionally, if the core is configured for Serial Wire (SW) mode and not JTAG, then the Serial Wire Viewer
(SWV) is available to provide a single pin to send out TPIU messages. Serial Wire Viewer is supported on all
SiM3Lxxx devices.
Most peripherals on SiM3L1xx devices have the option to halt or continue functioning when the core halts in debug
mode.
Summary of Contents for SiM3L1xx
Page 2: ...2 Rev 1 1 ...
Page 62: ...SiM3L1xx 62 Rev 1 1 6 2 SiM3L1x6 Pin Definitions Figure 6 2 SiM3L1x6 GQ Pinout ...
Page 63: ...SiM3L1xx Rev 1 1 63 Figure 6 3 SiM3L1x6 GM Pinout ...
Page 69: ...SiM3L1xx Rev 1 1 69 6 3 SiM3L1x4 Pin Definitions Figure 6 4 SiM3L1x4 GM Pinout ...
Page 74: ...SiM3L1xx 74 Rev 1 1 6 4 TQFP 80 Package Specifications Figure 6 5 TQFP 80 Package Drawing ...
Page 81: ...SiM3L1xx Rev 1 1 81 6 6 TQFP 64 Package Specifications Figure 6 9 TQFP 64 Package Drawing ...
Page 89: ...SiM3L1xx Rev 1 1 89 Figure 7 3 SiM3L1x4 GM Revision Information ...