M
ODEL
SL900A V
ERSION
V_1.0
P
REPARED BY
H/W
D
ATE
2006.06.30
S
UBJECT
T
ECHNICAL
M
ANUAL
P
AGE
20/51
SL900A
T
ECHNICAL
M
ANUAL
Figure 12. Key pressed with de-bounce mechanism
4.4
General Purpose Inputs/Outputs
MT6226M offers 57 general purpose I/O pins and 5 general-purpose output pins. By setting the control registers,
MCU software can control the direction, the output value and read the input values on these pins. These GPIOs
and GPOs are multiplexed with other functionalities to recude the pin count.
Upon hardware reset(/SYSRST), GPIOs are all configured as inputs.
Figure 13. GPIO Block diagram.
4.5
General Purpose Timer
Three general-purpose timers are provided. The Timers are 16 bits long and run independently of each other,
although they share the same clock source. Two timers can opeate in ont of two modes: one-shot mode and auto-
repeat mode; the other is a free running timer. In ont-shot mode, When the timer counts down and reaches zero,
it is halted. In auto-repeat mode, when the timer reaches zero, it simply resets to countdown initial value and
repeats the countdown to zero; this loop repeats until the disable signal is set to 1.
4.6
UART
The baseband chipset houses three UARTs. The UARTs provide full duplex serial communication channels
between baseband chipset and external devices.
In SL900A
, UART1(URXD1, UTXD1) is used for Factory Programming and UART3(URXD3, UTXD3) is
used for Blue Tooth Programming.
Содержание SL900A
Страница 1: ...SL900A SL900A ...