XA-H4 Datasheet, PDF (13/42 Pages) NXP Semiconductors – Single-chip 16-bit microcontroller

Philips Semiconductors
Single-chip 16-bit microcontroller
Preliminary specification
XA-H4
Table 3. Memory Mapped Registers (MMR)
MMR Name
Read/Write
or Read Only
Size
Address
Offset
Description
USART0 Registers
USART0 Write Register 0
R/W
8
800h Command register
USART0 Write Register 1
R/W
8
802h Tx/Rx Interrupt & data transfer mode
USART0 Write Register 2
R/W
8
804h Extended Features Control
USART0 Write Register 3
R/W
8
806h Receive Parameter and Control
USART0 Write Register 4
R/W
8
808h Tx/Rx miscellaneous parameters & mode
USART0 Write Register 5
R/W
8
80Ah Tx parameter and control
USART0 Write Register 6 (XA-H4 only)
R/W
8
80Ch HDLC/SDLC address field or asynch Match Character 0
USART0 Write Register 7
R/W
8
80Eh HDLC/SDLC flag or Match Character 1
USART0 Write Register 8
R/W
8
810h Transmit Data Buffer
USART0 Write Register 9
R/W
8
812h Master Interrupt control
USART0 Write Register 10
R/W
8
814h Miscellaneous Tx/Rx control register
USART0 Write Register 11
R/W
8
816h Clock Mode Control
USART0 Write Register 12
R/W
8
818h Lower Byte of Baud rate time constant
USART0 Write Register 13
R/W
8
81Ah Upper Byte of Baud rate time constant
USART0 Write Register 14
R/W
8
81Ch Miscellaneous Control bits
USART0 Write Register 15
R/W
8
81Eh External/Status interrupt control
USART0 Write Register 16
R/W
8
828h Match Character 2 (WR16)
USART0 Write Register 17
R/W
8
82Ah Match Character 3 (WR17)
USART0 Read Register 0
RO
8
820h Tx/Rx buffer and external status
USART0 Read Register 1
RO
8
822h Receive condition status/residue code
Reserved – do not write
824h
USART0 Read Register 3
RO
8
826h Interrupt Pending Bits
see WR16 and 17
828–82Ah see WR16 and 17 above
USART0 Read Register 6
RO
8
82Ch SDLC byte count low register
USART0 Read Register 7
RO
8
82Eh SDLC byte count high and FIFO status
USART0 Read Register 8
RO
8
830h Receive Buffer
Reserved
832h
USART0 Read Register 10
RO
8
834h Loop/clock status
Reserved
836-83Eh
USART1 Registers
USART1 Write Register 0
R/W
8
840h Command register
USART1 Write Register 1
R/W
8
842h Tx/Rx Interrupt & data transfer mode
USART1 Write Register 2
R/W
8
844h Extended Features Control
USART1 Write Register 3
R/W
8
846h Receive Parameter and Control
USART1 Write Register 4
R/W
8
848h Tx/Rx miscellaneous parameters & mode
USART1 Write Register 5
R/W
8
84Ah Tx parameter and control
USART1 Write Register 6
R/W
8
84Ch HDLC/SDLC address field or Match Character 0
USART1 Write Register 7
R/W
8
84Eh HDLC/SDLC flag or async Match Character 1
USART1 Write Register 8
R/W
8
850h Transmit Data Buffer
USART1 Write Register 9
R/W
8
852h Master Interrupt control
USART1 Write Register 10
R/W
8
854h Miscellaneous Tx/Rx control register
USART1 Write Register 11
R/W
8
856h Clock Mode Control
USART1 Write Register 12
R/W
8
858h Lower Byte of Baud rate time constant
USART1 Write Register 13
R/W
8
85Ah Upper Byte of Baud rate time constant
Reset
Value
00h
xx
xx
00h
00h
00h
00h
xx
xx
xx
00h
xx
00h
00h
xx
f8h
00h
00h
–
–
00h
xx
xx
00h
00h
00h
00h
xx
xx
xx
00h
xx
00h
00h
1999 Sep 24
13