Epson S1C17624 Technical Manual page 208

2
20 I C Master (I2CM)
20.1 i2CM Module Overview
The S1C17624/604/622/602/621 includes an I
The I2CM module operates as an I
The following shows the main features of I2CM:
• Operates as an I C bus master device (as single master only).
2
• Supports standard (100 kbps) and fast (400 kbps) modes.
• Supports 8-bit data length only (MSB first).
• 7-bit addressing mode (10-bit addressing is possible by software control.)
• Includes one-byte receive data buffer and one-byte transmit data buffer.
• Can generate start, repeated start, and stop conditions.
• Supports half-duplex communications.
• Supports clock stretch function.
• Includes a noise filter function to help improve the reliability of data transfers.
• Can generate transmit buffer empty and receive buffer full interrupts.
Figure 20.1.1 shows the I2CM configuration.
Internal bus
ITC
I 2 C master clock
(from T16 Ch.2)
20.2 i2CM input/Output Pins
Table 20.2.1 lists the I2CM pins.
Pin name I/O
SDA0 I/O
SCL0 I/O
The I2CM input/output pins (SDA0, SCL0) are shared with I/O ports and are initially set as general purpose I/O
port pins. The pin functions must be switched using the port function select bits to use the general purpose I/O port
pins as I2CM input/output pins.
For detailed information on pin function switching, see the "I/O Ports (P)" chapter.
S1C17624/604/622/602/621 TeChniCal Manual
2 C master (I2CM) module that supports two-wire communications.
C bus master device and can communicate with I
2
Bus I/F
and
control
registers Clock/transfer control
Interrupt
control
Figure 20. 1.1 I2CM Module Configuration
Table 20. 2.1 List of I2CM Pins
Qty
1 I2CM data input/output pin (see Note below)
Inputs serial data from the I
1 I2CM clock input/output pin (see Note below)
Inputs SCL line status. Also outputs a serial clock.
Seiko epson Corporation
Shift register
Noise
filter
Shift register
Function
2 C bus. Also outputs serial data to the I
2
20 i C MaSTeR (i2CM)
C-compliant slave devices.
2
SDA0
SCL0
I 2 C master
2 C bus.
20-1