MC68HC11G5 Datasheet, PDF (104/195 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller

Freescale Semiconductor, Inc.
RCKB — SCI Receive Baud Rate Clock Test
READ: Always returns logic 0
WRITE: Only while SMOD = 1 (test or bootstrap mode)
This bit is disabled and remains low in any mode other than test or bootstrap modes.
Reset clears this bit. While in test or bootstrap mode, this bit may be written but not read
(reads always return a logic zero). Setting this bit enables a baud rate counter test mode
where the exclusive-or of the receiver clock (16 times the baud rate) and the transmit
clock (1 times the baud rate) is driven out the PD1/TXD pin. This control bit is intended
only for factory testing of the MCU.
7-14
SERIAL COMMUNICATIONS INTERFACE
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