About the module Multiplexed GPIO
ConnectCore for i.MX51 Hardware Reference Manual
59
PWM
The ConnectCore for i.MX51 module provides two PWM interfaces. These PWM interfaces share the
output pad in the i.MX51 CPU with the I
2
C bus used on the module for the accelerometer. In order to
use the PWM signals the I
2
C bus must be disabled.
The main features of the PWM interface are the following:
n 16-bit up-counter with clock source selection
n 4 × 16 FIFO to minimize interrupt overhead
n 12-bit prescaler for division of clock
n Sound and melody generation
n Active high or active low configured output
n Can be programmed to be active in low power and debug modes
n Interrupts at compare and rollover
RTC
The ConnectCore for i.MX51 provides a Real Time Clock and a Secure Real Time clock.
The real time clock function is provided including time and day counters as well as an alarm function.
The RTC utilizes the 32.768KHz crystal oscillator for the time base and is powered by the coin cell
backup supply when main supply has dropped below operational range. In configurations where the
SRTC is used, the RTC can be disabled to conserve current drain. The accuracy of the 32.768KHz
crystal used for the Real-Time Clock is ±20ppm.
n RTC accuracy ±20ppm
n 17-bit time of day counter
n 15-bit day counter
n Time of day alarm
n Day alarm
The secure real time clock helps to comply with issues arising out of different applications requiring
secure and certifiable time, for example Digital Rights Management (DRM) schemes.
The main features of the secure RTC interface are the following:
n Secure 47-bit time counter
n Non-secure 47-bit time counter
n Use-mode protection. The SRTC cannot be configured by non-secured SW.
n Re-programming protection. The SRTC cannot be altered or disabled after SRTC locked.
n Clock source protection
n Programmable secure and non-secure alarms with interrupt
SPDIF
The ConnectCore for i.MX51 has a Sony/Philips Digital Interface Transmitter (SPDIF Tx) audio module
that allows the processor to transmit digital audio over it.
For the SPDIF transmitter, the processor provides the audio data. Zero is always inserted in the user
data. The SPDIF transmitter generates a SPDIF output bitstream in the biphase mark format
(IEC958), which consists of audio data, channel status, and user data. In the SPDIF transmitter, the
IEC958 biphase bit stream is generated on both edges of the SPDIF transmit clock.
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