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Diffstat (limited to 'docs/source/hardware/maple.rst')
| -rw-r--r-- | docs/source/hardware/maple.rst | 32 |
1 files changed, 27 insertions, 5 deletions
diff --git a/docs/source/hardware/maple.rst b/docs/source/hardware/maple.rst index 87878e9..4616ac7 100644 --- a/docs/source/hardware/maple.rst +++ b/docs/source/hardware/maple.rst @@ -13,22 +13,23 @@ Technical Specifications * MCU: **STM32F103RBT6**, a 32-bit ARM Cortex M3 microprocessor * Clock Speed: **72 MHz** - * Operating Voltage: 3.3V - * Input Voltage (recommended): 3V-12V + * **128KB Flash** and **20KB SRAM** * 44 Digital I/O Pins (:ref:`GPIO <gpio>`) * 16 Analog Input Pins, 12-bit **ADC** resolution (:ref:`ADC <adc>`) * 15 **PWM** pins at 16-bit resolution (:ref:`PWM <pwm>`) * Dedicated **USB** port for programming and communications (:ref:`USB <usb>`) * External **JTAG** interface (:ref:`JTAG <jtag>`) - * **128KB Flash** and **20KB SRAM** - * 64 Channel nested vector interrupt handler (including external interrupt on GPIOs) + * 64 Channel nested vector interrupt handler (including + :ref:`external interrupt <lang-attachinterrupt>` on GPIOs) * Integrated **SPI** (:ref:`SPI <spi>`) * Integrated **I2C** (:ref:`I2C <i2c>`) - * 7 Channels of Direct Memory Access (**DMA**) + * 7 Channels of Direct Memory Access (**DMA**) (:ref:`libmaple.dma`) * 3 **USART** divices (:ref:`USART <usart>`) * Four 4-channel **timers** (:ref:`Timers <timers>`) * Supplies up to 800mA @ 3.3v * Support for low power and sleep modes (<500uA) + * Operating Voltage: 3.3V + * Input Voltage (recommended): 3V-12V * Dimensions are 2.05″x2.1″ .. _maple-identify-rev: @@ -307,6 +308,13 @@ Rev 5 from its silkscreen. This mistake was fixed in later manufacturing runs. +* **Reset and NJTRST tied together**: The MCU's reset pin is tied to + PB4, the NJTRST pin, which is pin 43. Thus, attempting to use pin + 43 as a GPIO will reset your board (and also prevents the JTAG + "reset halt") command from working properly. It's possible to cut + the trace, but doing so will damage your board, so we *do not + recommend it* unless you're very sure about what you're doing. + Rev 3 ^^^^^ @@ -352,6 +360,13 @@ Rev 3 * **PWM Marketing Mistake**: We originally sold the Maple advertising 22 channels of 16-bit hardware PWM; actually the Maple only has 15. +* **Reset and NJTRST tied together**: The MCU's reset pin is tied to + PB4, the NJTRST pin, which is pin 43. Thus, attempting to use pin + 43 as a GPIO will reset your board (and also prevents the JTAG + "reset halt") command from working properly. It's possible to cut + the trace, but doing so will damage your board, so we *do not + recommend it* unless you're very sure about what you're doing. + Rev 1 ^^^^^ @@ -386,6 +401,13 @@ Rev 1 * **PWM Marketing Mistake**: We originally sold the Maple advertising 22 channels of 16-bit hardware PWM; the correct number is 15. +* **Reset and NJTRST tied together**: The MCU's reset pin is tied to + PB4, the NJTRST pin, which is pin 43. Thus, attempting to use pin + 43 as a GPIO will reset your board (and also prevents the JTAG + "reset halt") command from working properly. It's possible to cut + the trace, but doing so will damage your board, so we *do not + recommend it* unless you're very sure about what you're doing. + Recommended Reading ------------------- |