STM32W108C8U64TR STMicroelectronics, STM32W108C8U64TR Datasheet - Page 181

• Manufacturer Part Number: STM32W108C8U64TR
• Description: 16/32-BITS MICROS
• Manufacturer: STMicroelectronics
• Series: STM32r

Specifications of STM32W108C8U64TR

• Applications: RF4CE, Remote Control
• Core Processor: ARM® Cortex-M3™
• Program Memory Type: FLASH (64 kB)
• Controller Series: STM32W
• Ram Size: 8K x 8
• Interface: I²C, SPI, UART/USART
• Number Of I /o: 24
• Voltage - Supply: 1.18 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-VFQFN Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

STM32W108C8
13
Debug support
The STM32W108C8 includes a standard Serial Wire and JTAG (SWJ) Interface. The SWJ is
the primary debug and programming interface of the STM32W108C8. The SWJ gives debug
tools access to the internal buses of the STM32W108C8, and allows for non-intrusive
memory and register access as well as CPU halt-step style debugging. Therefore, any
design implementing the STM32W108C8 should make the SWJ signals readily available.
Serial Wire is an ARM® standard, bi-directional, two-wire protocol designed to replace
JTAG, and provides all the normal JTAG debug and test functionality. JTAG is a standard
five-wire protocol providing debug and test functionality. In addition, the two Serial Wire
signals (SWDIO and SWCLK) are overlaid on two of the JTAG signals (JTMS and JTCK).
This keeps the design compact and allows debug tools to switch between Serial Wire and
JTAG as needed, without changing pin connections.
While Serial Wire and JTAG offer the same debug and test functionality, ST recommends
Serial Wire. Serial Wire uses only two pins instead of five, and offers a simple
communication protocol, high performance data rates, low power, built-in error detection,
and protection from glitches.
The ARM® CoreSight Debug Access Port (DAP) comprises the Serial Wire and JTAG
Interface (SWJ).The DAP includes two primary components: a debug port (the SWJ-DP)
and an access port (the AHB-AP). The SWJ-DP provides external debug access, while the
AHB-AP provides internal bus access. An external debug tool connected to the
STM32W108C8's debug pins communicates with the SWJ-DP. The SWJ-DP then
communicates with the AHB-AP. Finally, the AHB-AP communicates on the internal bus.
Figure 51. SWJ block diagram
Serial Wire and JTAG share five pins:
●
●
●
●
●
Since these pins can be repurposed, refer to
page 15
descriptions and configurations.
pins
JRST
JTDO
JTDI
SWDIO/JTMS
SWCLK/JTCK
and
Section 8: General-purpose input/outputs on page 54
SWJ-DP
select
Doc ID 018587 Rev 1
interface
interface
JTAG
SWJ-DP
SW
SWJ-DAP
Section 3: Pinout and pin description on
AP interface
Control and
for complete pin
AHB-AP
Debug support
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AHB