PC87591L datasheet(158/437 Pages) NSC

158 / 437 page

Embedded Controller Modules (Continued)

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158

Revision 1.07

4.9.4

USART Registers

For a summary of the abbreviations used for Register Type, see “Register Abbreviations and Access” on page 34.

USART Register Map

Receive Data Buffer Register (URBUF)

Location: 00 FD2216

Type: RO

Transmit Data Buffer Register (UTBUF)

Location: 00 FD2016

Type: R/W

Baud Rate Pre-Scaler Register (UPSR)

Byte-wide read/write register containing the 5-bit pre-scaler value in bit 7 (MSB) through bit 3 (LSB) and the upper three bits

of the baud divisor in bit 2 (MSB) through bit 0 (LSB). The register is cleared (0016) on reset.

Location: 00 FD2E16

Type: R/W

Baud Rate Divisor Register (UBAUD)

This byte-wide read/write register contains the lower eight bits of the baud rate divisor. The UPSR register contains the upper

three bits. The register is cleared (0016) on reset.

Location: 00 FD2C16

Type: R/W

Mnemonic

Type

URBUF

Receive Data Buffer Register

UTBUF

Transmit Data Buffer Register

R/W

UPSR

Baud Rate Pre-Scaler Register

R/W

UBAUD

Baud Rate Divisor Register

R/W

UFRS

Frame Select Register

R/W

UMDSL

Mode Select Register

R/W

USTAT

Status Register

UICTRL

Interrupt Control Register

Varies per bit

Bit

76543210

Name

URBUF

Bit

76543210

Name

UTBUF

Bit

76543210

Name

UPSC

UDIV[10]: UDIV[8]

Reset

00000000

Bit

76543210

Name

UDIV[7]: UDIV[0]

Reset

00000000

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