KS57C2308/P2308/C2316/P2316
MEMORY MAP
4-27
SMOD
— Serial I/O Mode Register
FE1H, FE0H
Bit
7
6
5
4
3
2
1
0
Identifier
.7
.6
.5
"0"
.3
.2
.1
.0
RESET
Value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
R/W
W
W
W
Bit Addressing
8
8
8
8
1/8
8
8
8
.7–.5
Serial I/O Clock Selection and SBUF R/W Status Control Bits
0
0
0
Use an external clock at the
SCK
pin;
Enable SBUF when SIO operation is halted or when
SCK
goes high
0
0
1
Use the TOL0 clock from timer/counter 0;
Enable SBUF when SIO operation is halted or when
SCK
goes high
0
1
x
Use the selected CPU clock (fxx/4, 8, or 64; “fxx” is the system
clock); Enable SBUF read/write operation. “x” means “don't care.”
1
0
0
4.09 kHz clock (fxx/2
10
)
1
1
1
262 kHz clock (fxx/2
4
); Note: You cannot select a fxx/2
4
clock
frequency if you have selected a CPU clock of fxx/64
NOTE:
All kHz frequency ratings assume a system clock of 4.19MHz
.4
Bit 4
0
Always logic zero
.3
Initiate Serial I/O Operation Bit
1
Clear IRQS flag and 3-bit clock counter to logic zero; then initiate serial
transmission. When SIO transmission starts, this bit is cleared by hardware to
logic zero
.2
Enable/Disable SIO Data Shifter and Clock Counter Bit
0
Disable the data shifter and clock counter; the contents of IRQS flag is
retained when serial transmission is completed
1
Enable the data shifter and clock counter; The IRQS flag is set to logic one
when serial transmission is completed
.1
Serial I/O Transmission Mode Selection Bit
0
Receive-only mode; output buffer is off
1
Transmit-and-receive mode; output buffer is on
.0
LSB/MSB Transmission Mode Selection Bit
0
Transmit the most significant bit (MSB) first
1
Transmit the least significant bit (LSB) first
Summary of Contents for KS57C2308
Page 30: ...ADDRESS SPACES KS57C2308 P2308 C2316 P2316 2 22 NOTES ...
Page 168: ...SAM47 INSTRUCTION SET KS57C2308 P2308 C2316 P2316 5 94 NOTES ...
Page 170: ......
Page 206: ...POWER DOWN KS57C2308 P2308 C2316 P2316 8 8 NOTES ...
Page 210: ...RESET KS57C2308 P2308 C2316 P2316 9 4 NOTES ...
Page 222: ...I O PORTS KS57C2308 P2308 C2316 P2316 10 12 NOTES ...
Page 272: ...LCD CONTROLLER DRIVER KS57C2308 P2308 C2316 P2316 12 24 NOTES ...
Page 280: ...SERIAL I O INTERFACE KS57C2308 P2308 C2316 P2316 13 8 NOTES ...
Page 294: ...MECHANICAL DATA KS57C2308 P2308 C2316 P2316 15 2 NOTES ...
Page 310: ...KS57P2308 P2316 OTP KS57C2308 P2308 C2316 P2316 16 16 NOTES ...
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