SIO1007 datasheet(74/108 Pages) MICROCHIP

74 / 108 page

SIO1007

DS00002020A-page 74

 2005 - 2015 Microchip Technology Inc.

18.4.36

CR25

CR25 can only be accessed in the configuration state and after the CSR has been initialized to 25H. CR25 is used to

select the base address of Serial Port 2 (UART2). Serial Port 2 can be set to 96 locations on 8-byte boundaries from

100H - 3F8H. To disable Serial Port 2, set ADR9 and ADR8 to zero. Set CR25.0 to 0 when writing the UART2 Base

Address.

Serial Port 2 Address Decoding: address bits A[15:10] must be ‘000000’ to access UART2 registers. A[2:0] are decoded

as XXXb.

18.4.37

CR26

18.4.38

CR27

18.4.39

CR28

CR28 can only be accessed in the configuration state and after the CSR has been initialized to 28H. CR28 is used to

select the IRQ for Serial Port 1 (bits 7 - 4) and for Serial Port 2 (bits 3 - 0). The four bit IRQ encoding field is defined in

Table 18-32, "IRQ Encoding". Any unselected IRQ output (registers CR28 - CR2A) is in tristate. Shared IRQs are not

supported in the SIO1007.

TABLE 18-30: CR25

UART2 Base Address Register

Type: R/W

Default: 0X00 ON VCC POR

BIT NO.

BIT NAME

DESCRIPTION

Reserved

Read Only. A read returns 0.

ADR3

Serial Port 2 Base Address bits for decoder.

ADR4

ADR5

ADR6

ADR7

ADR8

ADR9

TABLE 18-31: CR28

UART Interrupt Selection

Type: R/W

Default: 0X00 ON VCC POR

BIT NO.

BIT NAME

DESCRIPTION

3:0

UART2 IRQ Select

These bits are used to select IRQ for Serial Port 2. See Table 18-32.

7:4

UART1 IRQ Select

These bits are used to select IRQ for Serial Port 1. See Table 18-32.

TABLE 18-32: IRQ ENCODING

Bits [3:0] Or Bits [7:4]

IRQ Selected

0000

NONE

0001

IRQ_1

0010

IRQ_2

0011

IRQ_3

0100

IRQ_4

0101

IRQ_5

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