AS8218 datasheet(103/123 Pages) AMSCO

103 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 103 of 123

Note: During ‘Write/Read EEPROM’ or ‘Write/Read XDATA’ the MCU keeps running. The SCT guarantees that

there is no collision between MCU and SCT memory accesses.

Command Interpreter

The command interpreter continuously looks at the UART1 input to detect if a command has been sent, i.e. a

specific byte that is defined to initiate a dedicated mode of operation (see flow diagram above).

The commands have been specified to lie outside the ‘normal’ ASCII range. All codes not specified within the

following table can directly be transferred to the MCU without any interference by the SCT.

Command Name

Code

Description

SOFT_RESET

F0h

Resets the chip and initiates a BOOTLOAD sequence, then the MCU program is

started.

RD_PROMPT

F1h

The chip sends a specific signature, ‘ALIVE’ which is ASCII coded. This can be

used to test the UART1/SCT interface.

SBAUD

F2h

Makes it possible to set the UART1 baudrate from outside the chip by directly

accessing the SFRs ‘SBaudL’ and ‘SBaudH’.

Default setting: 11 (3.5795MHz crystal and 19200 Baud)

READ_P

F3h

Enables reading of data from EEPROM.

WRITE_P

F4h

Data can be written to the EEPROM.

READ_X

F5h

Data from the XDATA address space can be read.

WRITE_X

F6h

Data can be written to any location in the XDATA address space.

SCT Registers

The system control (SCT) registers provide for the setting of various enables signals and selection of the MCU

clock (MCU_CLK) frequency.

Address Reset Value Description

9000h

Not used

enable signals

9001h

000b

See table below

mcuclkdiv[2:0]

9002h

000b

See table below

Enable Signals Register

The enable signals register includes power-down signals and other control signals.

MSB

LSB

enable_crc

u2clkoff

u1clkoff

dam

sdmi2_pd

afe_pd

Bit

Symbol

Function

Not used

AS8218 датащи(PDF) 103 Page - ams AG

AS8218 датащи(HTML) 103 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL