Renesas Hitachi H8S/2191, Hardware Manual

Page: 685 / 1065

Rev. 2.0, 11/00, page 658 of 1037
Bit 4: DFG Edge Selection Bit (EDG)
Selects the edge by which to count DFG.
Bit 4
EDG Description
0 Counts by the rising edge of DFG (Initial value)
1 Counts by the falling edge of DFG
Bit 3: Interrupt Selection Bit (ISEL1)
Selects the factor which causes an interrupt. (IRRHSW1)
Bit 3
ISEL1 Description
0 Generates an interrupt request by the rising edge of the STRIG signal of FIFO
(Initial value)
1 Generates an interrupt request by the matching signal of FIFO
Bit 2: FIFO Output Group Selection Bit (SOFG)
Selects whether 20 stages of FIFO1 + FIFO2 or only 10 stages of FIFO1 are used.
If 20-stage output mode is used in single mode, data write in FIFO1 and FIFO2 is required.
Monitor the output FIFO group flag (OFG) and control it by software. Output all the data of
FIFO2 after all the data of FIFO1 was output. Repeat this step again. If 10-stage output mode is
used, the data of FIFO2 is not reflected.
Rewriting the SOFG bit 0
→
1
→
0 initializes the control signal of the FIFO output stage to the
FIFO1 side.
Bit 2
SOFG Description
0 20-stage output of FIFO1 + FIFO2 (Initial value)
1 10-stage output of FIFO1 only
Bit 1: Output FIFO Group Flag (OFG)
Indicates the FIFO group which is outputting.
Bit 1
OFG Description
0 Pattern is being output by FIFO1 (Initial value)
1 Pattern is being output by FIFO2