CRC (1XE):
BIT	Bit Name	Function
0	STARTC	1=START TIMER C, 0=STOP TIMER C. This bit is automatically reset when TIMER C underflow, occurs during one shot mode.
1	PRD6 ON	1=TIMER C output appears on PRD6, 0=PRD6 normal port operation.
2	OUT-C MODE	1=TOGGLE output applied on port PRD6, 0=PULSE output applied on port PRD6.
3	RUN-C MODE	1=ONE-SHOT TIMER C operation, 0=CONTINUOUS TIMER C operation.
4	LOADC	1=FORCE LOAD on TIMER C (this is a STROBE input, there is no data storage, bit 4 will always read back a zero and writing a zero has no effect).
5	TMRC INMODE	1=TIMER C counts positive CNTB transitions, 0=TIMER C counts internal C1MHZ pulses.
6	SPB MODE	1=SERIAL B PORT output mode (CNTB sources shift clock), 0=SERIAL B PORT input mode (external shift clock on CNTB)
7	TODB IN	1=50 Hz operation. C7MHZ divided down by 101339 to generate TODB input of 10 Hz. 0=60 Hz operation. C7MHZ divided down by 102273 to generate TODB input of 10 Hz

CRD (1XF):
BIT	Bit Name	Function
(Bits 0-4 of the CRD register operate identically to bits 0-4 of the CRD register, except that functions now apply to TIMER D and bit I control's the output of TIMER D on PRD7).
5,6	TIMERD INMODE	Bits 5 and 6 select one of four input modes for TIMER D as follows: CRD6 CRD5 0 0 TIMER D counts C1MHz pulses. 0 1 TIMER D counts positive CNTB transitions. 1 0 TIMER D counts TIMERC underflow pulses. 1 1 TIMER D counts TIMERC underflows while CNTB is high.
7	ALARM TODB	1=writing to TODB registezs sets ALARM, 0=writing to TODB registers sets TODA clock.