... The Clock 1 header connects to the regular clock pin on the backplane and drives the CPU and Serial Module. The Clock 2 header connects to the Clock2 pin on the extended header. ...
... This is a multipurpose clock module. Primarily it generates a 7.3728 Mhz clock signal to run the RC2014. This is available on pin 21 of the Standard Bus which is used to run the CPU and UART. Optionally, this signal can be duplicated on the Clock2 pin of the Enhanced Bus, which can be used to clock a second UART port.
As a multi speed clock there are several options for clock speed output. The 7.3728Mhz clock can be divided by 2, 3, 6, 8, 12 or 24, which will give outputs of 3.6864, 2.4576, 1.2288, 0.9216, 0.6144 or 0.3072 Mhz respectively. Due to the serial baud rate being derived from the clock speed, this will equate to a baud rate of 57600, 38400, 19200, 14400, 9600 or 4800. Any of these speeds can be available on the primary Clock pin or the Clock2 pin. ...
