Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User's Manual
Chapter 12 Synchronous Serial Port with FIFO
FEUL620Q504 12–16
12.2.8 SIOF0 FIFO Status Register (SF0FSR)
Address: 0F78CH
Access: R
Access size: 8/16 bits
Initial value: 0000H
7 6 5 4 3 2 1 0
SF0FSRL - - - - - SF0TFD2 SF0TFD1 SF0TFD0
R/W R R R R R R R R
Initial value 0 0 0 0 0 0 0 0
15 14 13 12 11 10 9 8
SF0FSRH - - - - - SF0RFD2 SF0RFD1 SF0RFD0
R/W R R R R R R R R
Initial value 0 0 0 0 0 0 0 0
SF0FSR is a special function register (SFR) used to indicate the count transmitted and received by FIFO.
Description of Bits
•
SF0TFD2-0 (bits 2 to 0)
SF0TFD2-0 indicate the untransmitted byte (word) count of the transmit FIFO.
SF0TFD2 SF0TFD1 SF0TFD0 Description
0 0 0 Empty (initial value)
0 0 1 1Byte/1Word
0 1 0 2Byte/2Word
0 1 1 3Byte/3Word
1 0 0 4Byte/4Word (Full)
•
SF0RFD2-0 (bits 10 to 8)
SF0RFD2-0 indicate the byte (word) count received in the receive FIFO.
SF0RFD2 SF0RFD1 SF0RFD0 Description
0 0 0 Empty (initial value)
0 0 1 1Byte/1Word
0 1 0 2Byte/2Word
0 1 1 3Byte/3Word
1 0 0 4Byte/4Word (Full)