AS8218 datasheet(95/123 Pages) AMSCO

95 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 95 of 123

;-------------------------------------------------------------------------------

; program fragment for enabling uart2 for serial communication.

;

; sfr locations --

;

SCON2

EQU

0C0h

; Serial 2 Control Register

SBUF2

EQU

0C1h

; Serial 2 Port Register

SBAUDL2

EQU

0C2h

; Serial 2 Baudload LowByte

SBAUDH2

EQU

0C3h

; Serial 2 Baudload HighByte

;

; variables --

;

BaudrateLO

EQU

; Baudrate Value for 19200 baud,

BaudrateHI

EQU

; mcu_clk = 3.58MHz

;

; memory map for the uart2 configurations --

;

OUTMUX1

EQU

09503H

; need to be set as 0x80

SET_ENO

EQU

09505H

; need to be set as 0x80

SEL_PUPDO

EQU

09509H

; need to be set as 0x40

SEL_IN

EQU

0950BH

; need to be set as 0x05

;

; instruction code fragment

; ...

MOV

IE,#0A0h

; enable serial interrupt UART2 0xA0

MOV

DPTR,#OUTMUX1

; 09503H <- 80h ; maps txd2 to IO7

MOV

A,#080h

MOVX

@DPTR,A

MOV

DPTR,#SET_ENO

; 09505H <- 80h ; enable output IO7

MOV

A,#080h

MOVX

@DPTR,A

MOV

DPTR,#SEL_PUPDO

; 09509H <- 40h ; enable pullup for IO6

MOV

A,#040h

MOVX

@DPTR,A

MOV

DPTR,#SEL_IN

; 0950BH <- 05h ; map rxd2 to IO6

MOV

A,#005h

MOVX

@DPTR,A

MOV

SBAUDL2,#BaudrateLO ; set Baudrate (16 bits)

MOV

SBAUDH2,#BaudrateHI

MOV

SCON2,#050h

;

Set up uart2 serial port for Rx and Tx.

; ...

;-------------------------------------------------------------------------------

Timer 0

There is only Timer 0 present, Timer 1 is not implemented except for some flags in the TCON register, which

are also used for Timer 0. Furthermore, there is no counter mode available as the inputs T1 and INTO of the

standard 8051 are not mapped to external pins. The connection of Timer 0 in each of its four operating modes

is shown below.

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