Epson Research and Development Page 107
Vancouver Design Center
Hardware Functional Specification S1D13504
Issue Date: 01/01/30 X19A-A-002-18
bit 7 GPO Control
This bit is used to control the state of the SUSPEND# pin when it is configured as GPO. The SUS-
PEND# pin can be used as a power-down input (SUSPEND#) or as an output (GPO) possibly used
for controlling the LCD backlight power:
• When MD9 = 0 at rising edge of RESET#, SUSPEND# is an active-low Schmitt input used to
put the S1D13504 into suspend mode - see Section 13, “Power Save Modes” on page 128 for
details.
• When MD[10:9] = 01 at rising edge of RESET#, SUSPEND# is an output with a reset state of 1.
• When MD[10:9] = 11 at rising edge of RESET#, SUSPEND# is an output with a reset state of 0.
When this bit = 0 the GPO output is set to the reset state. When this bit = 1 the GPO output pin is
set to the inverse of the reset state.
bit 3 GPIO11 Pin IO Status
When GPIO11 is configured as an output, a “1” in this bit drives GPIO11 to high and a “0” in this
bit drives GPIO11 to low. When GPIO11 is configured as an input, a read from this bit returns the
status of GPIO11. Note the MD8 pin must be high at the rising edge of RESET# to enable GPIO11,
otherwise the VRTC pin is controlled automatically and this bit will have no effect on hardware.
bit 2 GPIO10 Pin IO Status
When GPIO10 is configured as an output, a “1” in this bit drives GPIO10 to high and a “0” in this
bit drives GPIO10 to low. When GPIO10 is configured as an input, a read from this bit returns the
status of GPIO10. Note the MD8 pin must be high at the rising edge of RESET# to enable GPIO10,
otherwise the HRTC pin is controlled automatically and this bit will have no effect on hardware.
bit 1 GPIO9 Pin IO Status
When GPIO9 is configured as an output, a “1” in this bit drives GPIO9 to high and a “0” in this bit
drives GPIO9 to low. When GPIO9 is configured as an input, a read from this bit returns the status
of GPIO9. Note the MD8 pin must be high at the rising edge of RESET# to enable GPIO9, other-
wise the DACRS1 pin is controlled automatically and this bit will have no effect on hardware.
bit 0 GPIO8 Pin IO Status
When GPIO8 is configured as an output, a “1” in this bit drives GPIO8 to high and a “0” in this bit
drives GPIO8 to low. When GPIO8 is configured as an input, a read from this bit returns the status
of GPIO8. Note the MD8 pin must be high at the rising edge of RESET# to enable GPIO8, other-
wise the DACRS0 pin is controlled automatically and this bit will have no effect on hardware.
GPIO Status / Control Register 1
REG[21h] RW
GPO
Control n/a n/a n/a GPIO11 Pin
IO Status GPIO10 Pin
IO Status GPIO9 Pin
IO Status GPIO8 Pin
IO Status