Rev. 1.0, 02/00, page 644 of 1141
Bits 7 and 6
Clock Source Selection Bits (CFCS1, CFCS0): CFCS1 and CFCS0 select the
clock to be supplied to the counter. (
φ
s = fosc/2)
Bit 7
Bit 6
CFCS1
CFCS0
Description
0
φ
s
(Initial value)
0
1
φ
s/2
0
φ
s/4
1
1
φ
s/8
Bit 5
Counter Overflow Flag (CFOVF): CFOVF flag indicates overflow of the 16-bit counter.
It is cleared by writing 0. Write 0 after reading 1. Setting has the highest priority in this flag. If a
flag set and 0 write occurs simultaneously, the latter is invalid.
Bit 5
CFOVF
Description
0
Normal state.
(Initial value)
1
Indicates that a overflow has occurred in the counter.
Bit 4
Error Data Limit Function Selection Bit (CFRFON): Enables the error data limit
function. (Limit values are the values set in the lock range data register (CFRUDR, CFRLDR)).
Bit 4
CFRFON
Description
0
Disables limit function.
(Initial value)
1
Enables limit function.
Bit 3
Capstan Lock Flag (CF-R/UNR): Sets a flag if an underflow occurred in the capstan lock
counter.
Bit 3
CF-R/UNR
Description
0
Indicates that the capstan speed system is not locked.
(Initial value)
1
Indicates that the capstan speed system is locked.