Hitachi H8S/2199 Hardware Manual page 630

Single-chip microcomputer

Table of Contents

Bits 7 and 6    Clock Source Selection Bits (DFCS1, DFCS0): DFCS1 and DFCS0 select the

clock to be supplied to the counter. (φs = fosc/2)

Bit 5    Counter Overflow Flag (DFOVF): DFOVF flag indicates the overflow of the 16-bit

timer 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.

Normal state.

Indicates that overflow has occurred in the counter.

Bit 4    Error Data Limit Function Selection Bit (DFRFON): Enables the error data limit

function. (Limit values are the values set in the lock range data registers (DFRUDR and

Bit 3    Drum Lock Flag (DF-R/UNR): Sets a flag if an underflow occurred in the drum lock

Rev. 1.0, 02/00, page 624 of 1141

Disables limit function.

Enables limit function.

Indicates that the drum speed system is not locked.

Indicates that the drum speed system is locked.

(Initial value)