I/O Memory Of Serial Interface - Epson S1C6P366 Technical Manual

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Serial Interface)

4.10.5 I/O memory of serial interface

Table 4.10.5.1 shows the I/O addresses and the control bits for the serial interface.
Register
Address
D3 D2
PUL13 PUL12 PUL11
FF45H
R/W
0 ESOUT SCTRG
FF70H
R
SDP SCPS SCS1
FF71H
R/W
SD3 SD2
FF72H
R/W
SD7 SD6
FF73H
R/W
0 0
FFE3H
R
0 0
FFF3H
R
*1 Initial value at initial reset
*2 Not set in the circuit
*3 Constantly "0" when being read
ESIF: Serial interface enable register (P1 port function selection) (FF70H•D0)
Sets P10–P13 to the input/output port for the serial interface.
When "1" is written: Serial interface
When "0" is written: I/O port
Reading: Valid
When "1" is written to the ESIF register, P10, P11, P12 and P13 function as SIN, SOUT, SCLK, SRDY,
respectively.
In the slave mode, the P13 terminal functions as SRDY output terminal, while in the master mode, it
functions as the I/O port terminal.
At initial reset, this register is set to "0".
Note: After setting ESIF to "1", wait at least 10 µsec before starting actual data transfer since a hazard
may be generated from the P12 (SCLK) terminal when ESIF is set to "1".
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Table 4.10.5.1 Control bits of serial interface
∗1
D1 D0 Name Init
PUL13 1
PUL10
PUL12 1
PUL11 1
PUL10 1
∗3 ∗2
0 –
ESIF
ESOUT 0
SCTRG 0
R/W
ESIF 0
SDP 0
SCS0
SCPS 0
SCS1 0
SCS0 0
∗2
SD3 –
SD1 SD0
∗2
SD2 –
∗2
SD1 –
∗2
SD0 –
∗2
SD7 –
SD5 SD4
∗2
SD6 –
∗2
SD5 –
∗2
SD4 –
∗3 ∗2
0 –
0 EISIF
∗3 ∗2
0 –
∗3 ∗2
0 –
R/W
EISIF 0
∗3 ∗2
0 –
0 ISIF
∗3 ∗2
0 –
∗3 ∗2
0 –
R/W
ISIF 0
1 0
On Off P13 pull-up control register
functions as a general-purpose register when SIF (slave) is selected
On Off
P12 pull-up control register (ESIF=0)
functions as a general-purpose register when SIF (master) is selected
SCLK (I) pull-up control register when SIF (slave) is selected
On Off P11 pull-up control register (ESIF=0)
functions as a general-purpose register when SIF is selected
On Off P10 pull-up control register (ESIF=0)
SIN pull-up control register when SIF is selected
Unused
Enable Disable SOUT enable/disable control
Trigger Invalid Serial I/F clock trigger (writing)
Run Stop Serial I/F clock status (reading)
SIF I/O Serial I/F enable (P1 port function selection)
MSB first LSB first Serial I/F data input/output permutation
Serial I/F clock phase selection
Serial I/F
clock mode selection
High Low MSB
High Low
Serial I/F transmit/receive data (low-order 4 bits)
High Low
High Low
LSB
High Low MSB
High Low
Serial I/F transmit/receive data (high-order 4 bits)
High Low
High Low LSB
Unused
Unused
Unused
Enable Mask Interrupt mask register (Serial I/F)
(R) (R) Unused
Yes No Unused
(W) (W) Unused
Reset Invalid
Interrupt factor flag (Serial I/F)
EPSON
Comment
[SCS1, 0] 0
Clock Slave
[SCS1, 0] 2
Clock OSC1/2 OSC1
S1C6P366 TECHNICAL MANUAL
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