Register Descriptions

NOTE

The minimum value that can be loaded on the concatenation of UBG1n with UBG2n is 0x0002. Both UBG1n and UBG2n are write-only and cannot be read by the CPU.

23.3.12 UART Input Port Register (UIPn)

The UIPn registers, shown in Figure 23-14,show the current state of the CTS input.

Field

Reset

R/W

Address

7

1

0

 

CTS

 

 

 

1111_1111

R

IPSBAR + 0x234 (UIP0), 0x274 (UIP1), 0x2B4 (UIP2)

Figure 23-14. UART Input Port Register (UIPn)

Table 23-10describes UIPn fields.

 

 

 

 

 

Table 23-10. UIPn Field Descriptions

 

 

 

 

 

 

 

 

 

 

 

 

Bits

 

Name

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

7–1

 

Reserved, should be cleared.

 

 

 

 

 

 

 

 

 

 

0

 

CTS

Current state of clear-to-send. The

 

value is latched and reflects the state of the input pin when UIPn

 

CTS

 

 

 

 

is read. Note: This bit has the same function and value as UIPCRn[RTS].

 

 

 

 

 

0

The current state of the

CTS

input is logic 0.

 

 

 

 

 

1

The current state of the

CTS

input is logic 1.

 

 

 

 

 

 

 

23.3.13

UART Output Port Command Registers (UOP1n/UOP0n)

The RTS output can be asserted by writing a 1 to UOP1n[RTS] and negated by writing a 1 to UOP0n[RTS]. See Figure 23-15.

Field

Reset

R/W

Addr

7

1

0

 

RTS

 

 

 

0000_0000

W

UART0: IPSBAR + 0x238 (UOP1), 0x23C (UOP0); UART1 0x278 (UOP1), 0x27C (UOP0); UART2 0x2B8 (UOP1) 0x2BC

(UOP0)

Figure 23-15. UART Output Port Command Registers (UOP1n/UOP0n)

Table 23-11describes UOP1 and UOP0 fields.

MOTOROLA

Chapter 23. UART Modules

23-15

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Image 489
Motorola MCF5281 Uart Input Port Register UIPn, Uart Output Port Command Registers UOP1n/UOP0n, 10describes UIPn fields