Rainbow Electronics AT83C26 - Manual (Page 35)

35
7511B–SCR–10/05
AT83C26
Read Command
After a write command, even with a length of 0 byte, the next read operation is performed on the
corresponding byte. The write command sets the “read pointer”.
After the reset, the “read pointer” is on SC1 registers
FFh is completing the transfer if the micro controller attempts to read beyond the last byte.
Flags are only reseted after the corresponding byte read has been acknowledged by the master.
Figure 23. Read command byte
Table 7. Read Commands Description
b7 b6 b5 b4 b3 b2 b1
0 0 1 0 X X 1
levels on reset
b0
1
A2 A1
1. After reset or
write command
number 2, 3, 4
2. After
write
command
number 6
3. After
write command
number 7
4. After
write
command
number 8
5. After
write
command
number 9
6. After
write
command
number 10
7. After
write
command
number 11
8. After
write
command
number 12
[0] SC1_STATUS STATUSB SC2_CFG0 SC3_CFG0 SC4_CFG0 SC5_CFG0 DCDCB SLEW_CTRL_1
[1] SC1_CFG0 IO_SELECT SC2_CFG1 SC3_CFG2 SC4_CFG2 SC5_CFG2 LDO SLEW_CTRL_2
[2] SC1_CFG1 INTERFACE_B SC2_CFG2 0xFF 0xFF 0xFF 0xFF SLEW_CTRL_3
[3] SC1_CFG2 ITDIS 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
[4] SC1_CFG3 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
[5] SC1_CFG4 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
[6] SC1_INTERFACE 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
[7] TIMER_MSB 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
[8] TIMER_LSB 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
[9] CAPTURE_MSB 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
[10] CAPTURE_LSB 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
[11] 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF