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ST2204 Scheda tecnica(PDF) 8 Page - Sitronix Technology Co., Ltd.

Il numero della parte ST2204
Spiegazioni elettronici  8 BIT Integrated Microcontroller with 512K Bytes ROM
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Produttore elettronici  SITRONIX [Sitronix Technology Co., Ltd.]
Homepage  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

ST2204 Scheda tecnica(HTML) 8 Page - Sitronix Technology Co., Ltd.

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ST2204
Ver 0.6
8/24
2008/11/10
7
7.. G
GP
PIIO
O
The ST2204 consists of 48 general-purpose I/O (GPIO) which
are divided into six I/O ports: Port-A/B/C/D/E and Port-L.
Each single pin can be programmed to be input or output. This
is controlled by port direction control registers PCx. Setting bit
of PCx makes respective pin to output, and clearing this bit for
input. There are two options: pull-up/down for inputs of Port-C
but only pull-up for inputs of the other ports. In case of output,
there are open-drain/CMOS options for outputs of PortC but
only CMOS for the other ports. Refer to TABLE 7-1.
TABLE 7-1 I/O Types Of GPIO Ports
I/O Types
I/O Mode
Port-A/B/D/E/L
Port-C
Input
Pull-up/Pure
Pull-up/Pull-down/Pure
Output
CMOS
Open-drain/CMOS
Input Mode
In case of input function, port data registers Px reflect the
values on associated pins. Besides read instruction for data of
signals input, writing to register Px selects I/O types of pins,
pull-up or pull-down. Setting bits of all port data register Px to
select pull-up type. Clearing bits of only PC to select pull-down
type for pins of Port-C. There are no pull-down resistors for
Port-A/B/D/E and Port-L, thereby no pull-down resistors will be
enabled if clearing bits of PA, PB, PD, PE and PL. Pull-up
resistors of Port-A/B/D/E/L are also controlled by PULL bit (bit7
of port miscellaneous register PMCR), “0” is to disable, while
“1” is to enable them. The pull-up/pull-down resistors of Port-C
are further controlled by bits of port type select registers PSC.
They work in the same way with PULL bit of PMCR but only on
single pin, “0” is to disable, while “1” is to enable.
VCC
PORT
DATA
REGISTER
( PDR )
PULL-UP
PMOS
PULL-UP
RD_INPUT
DATA INPUT
PORT
CONTROL
REGISTER
( PCR )
FIGURE 7-1 Configuration Of Port-A/B/D/E/L
Output Mode
In case of output function, Write to port data registers Px
makes pins to output desired value. This value can also be
read back by read instruction. Besides Port-C, the output pins
are CMOS type. Port-C have two options of output types:
open-drain and CMOS, and is controlled by port type select
registers PSC. Clearing bits of registers PSC is for that disable
PMOS of output stage and left only NMOS, while setting bits is
for CMOS.
Port-A is designed for keyboard scan with de-bounce and
transition triggered interrupt, while Port-C/D/E are multiplexed
with other system functions, and are controlled by PFC, PFD,
and PMCR[2:0]. Port-L is shared with LCD specific signals of
LCDC. Turning off LCDC by setting LPWR (LCTR[7]) reserves
Port-L for GPIO.
Selecting respective pins to be GPIO or signals of system
function will not affect original settings of I/O directions and
types. This entends the flexibility of the usage of function
signals.
Note: All the properties of pins are still programmable
and must be ascertained before they are
assigned to system functions, especially the
direction of pins.
FIGURE 7-2 Configuration Of Port-C


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