e) On-Chip Microcontroller (OCM)
The gm2120 on-chip microcontroller (OCM) serves as the system microcontroller. That is, it programs the
gm2120 and manages other devices in the system such as the keypad, the backlight, LED, audio and
non-volatile RAM using general purpose input/output (GPIO) pins.
Pin NumberPin NamePin Usage
40GPIO0 / PWM0Backlight control
41GPIO1 / PWM1Volume control
42GPIO2 / PWM2Key-Left
43GPIO3 / TIMERKey-Up
44GPIO4 / UART_DIDebug Purpose
45GPIO5 / UART_DODebug Purpose
46GPIO6Key-Right
47GPIO7Key-Down
39GPIO8 / IRQINnLED-Orange
48GPIO9Key-Sel
49GPIO10Key-Menu
50GPIO11No use
51GPIO12NV- RAM (U4) SDA
52GPIO13NV- RAM (U4) SCL
205GPIO16 / HFSnNV- RAM (U11) SCL
1GPIO17No use
208GPIO18No use
207GPIO19Key-Power, on / off control
206GPIO20Mute , audio disable
4GPIO21 / IRQnLED-Green
204GPIO22 / HCLKNV- RAM (U11) SDA
f) Panel Power Sequencing ( PPWR, PBIAS) ( Pin 113~114)
The gm2120 has two dedicated outputs PPWR and PBIAS (Pin113 and Pin114) to control LCD power
sequencing once data and control signals are stable.
g) Parallel ROM Interface Port (Pin 8~25, Pin28~35)
The gm2120 has parallel ROM interface port, pin8~25 for address bus, pin28~35 for data bus.
h) Panel interface (Pin 55~66, Pin69~80, Pin83~87, Pin90~96.Pin99~110)
The gm2120 driver interface is highly programmable. It supports dual bus / dual port for SXGA drivers.
4-2
MAXDATABelinea 101715 |
ACEC
MITAC
