Rev. 3.0, 03/01, page 237 of 390
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESET -
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
R/W
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
15.2.7
Receive Data Buffers (RXDB0,1)
RXDB0 and RXDB1 are receive data storage buffers, and are able to store 48-word data. The
hardware configuration determines the buffer, where the data are received. Users can access only
one buffer that is not used to receive data. RDB0 and RDB1 are not initialized in the STANDBY
mode.
15.2.8
Receive Shift Register (RSFTR)
RSFTR, a 16-bit register, is used to convert a serial receive data into a parallel one. Note that
READ/WRITE operations cannot be performed to this register. The initial value of this register is
undefined at RESET or in the STANDBY mode.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESET -
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
R/W
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
15.3
Data Transfer
15.3.1
Data Transmit
Data are transmitted by setting the TE bit in CTR to 1. The transmitted data are stored in TXDR
(transmit data register), or TXSB0/TXDB1 (transmit data buffers 0 or 1), which can be selected by
the BUFD bit in CTR.
Data Transmit with Buffer
When data are transmitted via TXDB0/TXDB1, buffer 0 or 1, which is used for data transmission,
is selected by hardware. This will enable the CPU (SH3) to access only one buffer, which is not
used for data transmission.
When the data in the buffer 0 are completely transmitted, a transmit data empty interrupt (TDEI) is
generated to the CPU interface, and an interrupt request is then output as a chip interrupt from the
CPU interface to the CPU (SH3). A transmit data error interrupt (TERI) is then output if FS (frame
synchronous signal) are received when the data in the buffer 1 are completely transmitted and the
next data to be transmitted is not written. When a buffer (TXDB0/TXDB1) is used for data
transmission, a transmit data register (TXDR) is used as a transmit register to control the AFE data.
Summary of Contents for HD64465
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