T83C5121XXX-ICSIL datasheet(36/115 Pages) ATMEL

tên linh kiện	T83C5121XXX-ICSIL

Giải thích chi tiết về linh kiện	8-bit Microcontroller with Multiprotocol Smart Card Interface

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36 / 115 page

A/T8xC5121

4164G–SCR–07/06

Figure 22. Alternate Card

Card Presence Input

The internal pull-up on Card Presence input can be disconnected in order to reduce the

consumption (CPRESRES, bit 3 in PMOD0).

In this case, an external resistor (typically 1 M

Ω) must be externally tied to V

CC.

CPRES input can generate an interrupt (see Interrupt system section).

The detection level can be selected.

SCIB Reset

The SCICR register contains a reset bit. If set, this bit generates a reset of the SCI and

its registers. Table 15 shows the SCIB registers that are reseted and their reset values.

Table 14. Reset Values for SCI Registers

SIM,SAM

CARD

Alternate

card

CRST

CIO

CCLK

CK_IDLE

CCLK1

SCSR Reg.

PR3

SCSR Reg.

ALTKPS0,1

SCCLK1

FCK_IDLE

1, 2, 4 or 8

P3.6

Main

card

CPRES

SCIB Reset Value (Binary)

SCICR

0000 0000b

SCCON

0X00 0000b

SCISR

1000 0000b

SCIIR

0X00 0000b

SCIER

0X00 0000b

SCSR

XXX0 1000b

SCTBUF

0000 0000b

SCRBUF

0000 0000b

SCETU1, SCETU0

XXX X001b, 0111 0100b (372)

SCGT1, SCGT0

XXXX XXX0b, 0000 1100b (12)

SCWT2, SCWT1, SCWT0

0000 0000b, 0010 0101b, 1000 0000b (9600)

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