Rainbow Electronics AT75C220 - Manual (Page 137)

AT75C220
137
SPI Transmit Pointer Register
Register Name:SP_TPR
Access Type:Read/write
Reset Value:0x0
• TXPTR: Transmit Pointer Register
TXPTR must be loaded with the address of the transmit buffer.
SPI Transmit Counter Register
Register Name:SP_TCR
Access Type:Read/write
Reset Value:0x0
• TXCTR: Transmit Counter Register
TXCTR must be loaded with the size of the receive buffer.
0 = Stop peripheral data transfer
1 - 4294967295 = Start peripheral data transfer if TDRE is active.
31 30 29 28 27 26 25 24
TXPTR
23 22 21 20 19 18 17 16
TXPTR
15 14 13 12 11 10 9 8
TXPTR
7 6 5 4 3 2 1 0
TXPTR
31 30 29 28 27 26 25 24
TXCTR
23 22 21 20 19 18 17 16
TXCTR
15 14 13 12 11 10 9 8
TXCTR
7 6 5 4 3 2 1 0
TXCTR