Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
45
4.2.8.
Transfer Byte Register: TBYTE
Transfer Byte Register (TBYTE) indicates the transfer data count when serial chip select pins are active.
TBYTEn(n=0 to 11) : Address Base addr + 1B
H
(Access: Byte, Half-word,
Word)
7
6
5
4
3
2
1
0
bit
TBYTE[7:0]
0
0
0
0
0
0
0
0
Initial value
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Attribute
[bit15 to bit0] TBYTE: Transfer data count Indication bits
Transfer Byte Register (TBYTE) is used for synchronous transmissions or external triggered transmissions.
When a transmission is started by a synchronous transmission or external triggered transmission, data count
set at the TBYTE will be transferred.
TBYTE
Transfer byte register
Write
Sets transfer count
Read
Reads remaining transfer count
⋅
When (0000)H is set to this register, the Serial Timer Register still indicates "0".
MB91520 Series
MN705-00010-1v0-E
1358