Px Port Pull-Up/Down Control Register; Px Port Interrupt Flag Register; Px Port Interrupt Control Register - Epson S1C17M20 Technical Manual

6 I/O PORTS (PPORT)
When both data output and data input are enabled, the pin output status controlled by this IC can be
read.
These bits do not affect the input control when the port is used as a peripheral I/O function.
Bits 7–0 PxOEN[7:0]
These bits enable/disable the GPIO port output.
1 (R/W): Enable (Data is output from the port pin.)
0 (R/W): Disable (The port is placed into Hi-Z.)
These bits do not affect the output control when the port is used as a peripheral I/O function.

Px Port Pull-up/down Control Register

Register name Bit
PxRCTL 15–8 PxPDPU[7:0]
7–0 PxREN[7:0]
*1: This register is effective when the GPIO function is selected.
*2: The bit configuration differs depending on the port group.
Bits 15–8 PxPDPU[7:0]
These bits select either the pull-up resistor or the pull-down resistor when using a resistor built into
the port.
1 (R/W): Pull-up resistor
0 (R/W): Pull-down resistor
The selected pull-up/down resistor is enabled when the PxRCTL.PxRENy bit = 1.
Bits 7–0 PxREN[7:0]
These bits enable/disable the port pull-up/down control.
1 (R/W): Enable (The built-in pull-up/down resistor is used.)
0 (R/W): Disable (No pull-up/down control is performed.)
Enabling this function pulls up or down the port when output is disabled (PxIOEN.PxOENy bit = 0).
When output is enabled (PxIOEN.PxOENy bit = 1), the PxRCTL.PxRENy bit setting is ineffective re-
gardless of how the PxIOEN.PxIENy bit is set and the port is not pulled up/down.
These bits do not affect the pull-up/down control when the port is used as a peripheral I/O function.

Px Port Interrupt Flag Register

Register name Bit
PxINTF 15–8 –
7–0 PxIF[7:0]
*1: This register is effective when the GPIO function is selected.
*2: The bit configuration differs depending on the port group.
Bits 15–8 Reserved
Bits 7–0 PxIF[7:0]
These bits indicate the port input interrupt cause occurrence status.
1 (R): Cause of interrupt occurred
0 (R): No cause of interrupt occurred
1 (W): Clear flag
0 (W): Ineffective

Px Port Interrupt Control Register

Register name Bit
PxINTCTL 15–8 PxEDGE[7:0]
7–0 PxIE[7:0]
*1: This register is effective when the GPIO function is selected.
*2: The bit configuration differs depending on the port group.
6-8
Bit name Initial
0x00
0x00
Bit name Initial
0x00
0x00
Bit name Initial
0x00
0x00
Seiko Epson Corporation
Reset R/W
H0 R/W –
H0 R/W
Reset R/W
– R –
H0 R/W Cleared by writing 1.
Reset R/W
H0 R/W –
H0 R/W
S1C17M20/M21/M22/M23/M24/M25
Remarks
Remarks
Remarks
TECHNICAL MANUAL (Rev. 1.0)