Model
MASS 2
Version
V_1.0
Prepared by
H/W
Date
22/01/2008
Subject Technical
Manual Page
20/59
similar AC requirements, a generic configuration scheme to interface them is desired. This way, the software program can
treat different components by simply specifying certain predefined parameters. All these parameters are based on the cycle
time of system clock. The interface definition based on such a scheme is listed in Table 17. Note that, this interface always
works with data in Little Endian format for all types of access.
Table 17 External Memory Interface Signal of MT6225
4.
Microcontroller Peripherals
Microcontroller(MCU) Peripherals are devices that are under direct control of the Microcontroller. Most of the devices are
attached to the Advanced Peripheral Bus(APB) of the MCU subsystem, and serve as APB slaves. Each MCU peripheral must
be accessed as a memory-mapped I/O device: that is, the MCU or the DMA bus master reads from or writes to the specific
peripheral by issuing memory-addressed transactions.
Pulse-Width Modulation Outputs.
Two generic Pulse-Width Modulators are implemented to generate pulse sequences with programmable frequency and duty
cycle for LCD backlight or charging purpose. The duration of the PWM output signal is low as long as the internal counter
value is greater than or equal to the threshold value.
SIM Interface
The MT6225 contains a dedicated smart card interface to allow the MCU access to the SIM card. It can operate via 5
terminals, using SIMVCC, SIMSEL, SIMRST, SIMCLK and SIMDATA.
The SIMVCC is used to control the external voltage supply to the SIM card and SIMSEL determines the regulated smart card
supply voltage. SIMRST is used as the SIM card reset signal. Besides, SIMDATA and SIMCLK are used for data exchange
purpose. Basically, the SIM interface acts as a half duplex asynchronous communication port and its data format is composed
of ten consecutive bits: a start bit in state Low, eight information bits and a tenth bit used for parity checking.
Содержание MASS2
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