Section 22 Serial I/O with FIFO (SIOF)
Rev.1.00 Dec. 13, 2005 Page 836 of 1286
REJ09B0158-0100
22.4.6 FIFO
Overview: The transmit and receive FIFOs of the SIOF have the following features.
•
16-stage 32-bit FIFOs for transmission and reception
•
The FIFO pointer can be updated in one read or write cycle regardless of access size of the
CPU and DMAC. (One-stage 32-bit FIFO access cannot be divided into multiple accesses.)
Transfer Request: The transfer request of the FIFO can be issued to the CPU or DMAC as the
following interrupt sources.
•
FIFO transmit request: TDREQ (transmit interrupt source)
•
FIFO receive request: RDREQ (receive interrupt source)
The request conditions for FIFO transmit or receive can be specified individually. The request
conditions for the FIFO transmit and receive are specified by the bits TFWM[2:0] and the bits
RFWM[2:0] in SIFCTR, respectively. Table 22.11 and table 22.12 summarize the conditions
specified by SIFCTR.
Table 22.11 Conditions to Issue Transmit Request
TFWM[2:0]
Number of
Requested Stages
Transmit Request
Used Areas
000
1
Empty area is 16 stages
100
4
Empty area is 12 stages or more
101
8
Empty area is 8 stages or more
110
12
Empty area is 4 stages or more
Smallest
111
16
Empty area is 1 stage or more
Largest
Table 22.12 Conditions to Issue Receive Request
RFWM[2:0]
Number of
Requested Stages
Receive Request
Used Areas
000
1
Valid data is 1 stage or more
100
4
Valid data is 4 stages or more
101
8
Valid data is 8 stages or more
110
12
Valid data is 12 stages or more
Smallest
111
16
Valid data is 16 stages
Largest
Содержание SH7780 Series
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