ARM, RISC-V контроллеры

А вот тут у меня встречный вопрос: Железа у меня пока нет, но юзер мануал на LPC21[12][24] я почитал. И среди замечаных неточностей было и то что в таблице IOPINn описан как ReadOnly а в пояснении написанно:

GPIO USAGE NOTES
   If for the specified output pin corresponding bit is set both
   in GPIO Output Set Register (IOnSET) and in GPIO Output Clear
   Register (IOnCLR), observed pin will output level determined
   by the later write access of IOnSET nad IOnCLR. This means that
   in case of sequence:
      IO0SET = 0x0000 0080
      IO0CLR = 0x0000 0080
   pin P0.7 will have low output, since access to Clear register
   came after access to Set register.

  Applications that require instanatneous appearance of zeros and
  ones on the respected parallel port can use direct access to
  port s corresponding GPIO Pin Value Register (IOPIN). Assuming
  that pins P0.8 to P0.15 are configured as output, write to
  IO0PIN:
     IO0PIN = 0x0000 C700
  will produce the same output as following sequence of writes:
     IO0SET = 0x0000 C700
     IO0CLR = 0x0000 3800

  Solution utilizing access to IO0SET and IO0CLR will take more
  steps compared to a single IO0PIN write access.

Вот и хочется узнать как на самом деле? Я скачивал файл UM_LPC2114_2124_2212_2214_2.pdf который является Preliminary User Manual. А существуют ли частные релизы документации?