tmp19a43fzxbg TOSHIBA Semiconductor CORPORATION, tmp19a43fzxbg Datasheet - Page 277

• Manufacturer Part Number: tmp19a43fzxbg
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Timing at which received
data is written to buffer
Timing at which transmit
data is written to buffer
SCLK0 input
TXD0
RXD0
(INTTX0 interrupt request)
(INTRX0 interrupt request)
double-buffer is always enabled in SCLK input mode), 8-bit data is output on the TXD0 pin
and 8-bit data is shifted into the receive buffer simultaneously when the SCLK input becomes
active with data present in the transmit buffer. When all bits of data have been transmitted, a
transmit interrupt (INTTX0) is generated. When all bits of data have been received and then
transferred from receive buffer 1 to receive buffer 2, a receive interrupt (INTRX0) is generated.
Next transmit data must be written to the transmit buffer before the SCLK pulse for the next
frame is input, that is, before point A in the figure below. Because the receive double-buffer is
enabled, the received data must be read before the reception of the next frame is completed.
transmit buffer 2 is transferred to transmit buffer 1, generating a transmit interrupt (INTTX0),
when all bits of data in transmit buffer 1 have been transmitted. When the received 8-bit data
has been shifted into receive buffer 1, the data is transferred to receive buffer 2, generating a
receive interrupt (INTRX0). Then, the SCLK input pulse for the next frame initiates the
transmission of the data transferred from transmit buffer 2 to transmit buffer 1 and the
reception of data into receive buffer 1. If the data in receive buffer 2 is not read before the last
bit of the frame is received, an overrun error occurs. If transmit data is not written to transmit
buffer 2 before the SCLK pulse for the next frame is input, an underrun error occurs.
If WBUF = 0, that is, the transmit double-buffer is disabled in SCLK input mode (the receive
If WBUF = 1, that is, both the transmit and receive double-buffers are enabled, the data in
bit 0
bit 0
TMPR1942CY/CZ-276
bit 1
bit 1
When WBUF = 0
bit 5
bit 5
bit 6
bit 6
bit 7
bit 7
TMP1942 CY/CZ
A
bit 0
bit 0
bit 1
bit 1