參數(shù)資料
型號： XE8000EV104
廠商： Semtech
文件頁數(shù)： 138/156頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR XE8805AMI028LF
標(biāo)準(zhǔn)包裝： 1
類型： MCU
適用于相關(guān)產(chǎn)品： XE88LC05AMI028
所含物品： 完全組裝的評估板
Semtech 2006
www.semtech.com
15-2
XE8805/05A
15.1 Features
The USRT implements a hardware support for software implemented serial protocols:
Control of two external lines S0 and S1 (read/write).
Conditional edge detection generates interrupts.
S0 rising edge detection.
S1 value is stored on S0 rising edge.
S0 signal can be forced to 0 after a falling edge on S0 for clock stretching in the low state.
S0 signal can be stretched in the low state after a falling edge on S0 and after a S1 conditional detection.
15.2 Overview
The USRT block supports software universal synchronous receiver and transmitter mode interfaces.
External lines S0 and S1 respectively correspond to clock line and data line. S0 is mapped to PB[4] and S1 to
PB[5] when the USRT block is enabled. It is independent from RegPBdir (Port B can be input or output). When
USRT is enabled, the configurations in port B for PB[4] and PB[5] are overwritten by the USRT configuration.
Internal pull-ups can be used by setting the PBPullup[5:4] bits.
Conditional edge detections are provided.
RegUsrtS1 can be used to read the S1 data line from PB[5] in receive mode or to drive the output S1 line PB[5] by
writing it when in transmit mode. It is advised to read S1 data when in receive mode from the RegUsrtBufferS1
register, which is the S1 value sampled on a rising edge of S0.
15.3 Register map
Block configuration registers:
pos.
RegUsrtS1
rw
reset
function
7-1
-
r
0000000
Unused
0
UsrtS1
rw
1 resetsystem
Write: data S1 written to pad PB[5]),
Read: value on PB[5] (not UsrtS1 value).
Table 15-1: RegUsrtS1
pos.
RegUsrtS0
rw
Reset
function
7-1
-
r
0000000
Unused
0
UsrtS0
rw
1 resetsystem
Write: clock S0 written to pad PB[4],
Read: value on PB[4] (not UsrtS0 value).
Table 15-2: RegUsrtS0
The values that are read in the registers RegUsrtS1 and RegUsrtS0 are not necessarily the same as the values
that were written in the register. The read value is read back on the circuit pins, not in the registers. Since the
outputs are open drain, a value different from the register value may be forced by an external circuit on the circuit
pins.
Not
Recommended
for
New
Designs
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