XR16L78464-TQFP EXAR [Exar Corporation], XR16L78464-TQFP Datasheet - Page 23

• Manufacturer Part Number: XR16L78464-TQFP
• Description: HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
• Manufacturer: EXAR [Exar Corporation]

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REV. 1.2.0
TIMER [7:0] (default 0x00): Reserved.
TIMERMSB [7:0] and TIMERLSB [7:0]
TIMERMSB and TIMERLSB form a 16-bit value. The least-significant bit of the timer is being bit [0] of the
TIMERLSB with most-significant-bit being bit [7] in TIMERMSB. Reading the TIMERCNTL register will clear its
interrupt. Default value is zero upon powerup and reset.
Each bit selects 8X or 16X sampling rate for that UART channel, bit-0 is channel 0. Logic 0 (default) selects
normal 16X sampling with logic one selects 8X sampling rate. Transmit and receive data rates will double by
selecting 8X.
The 8-bit Reset register [RESET] provides the software with the ability to reset individual UART(s) when there
is a need. Each bit is self-resetting after it is written a logic 1 to perform a reset to that channel. All registers in
that channel will be reset to the default condition, see
channel 0 with bit-3=1 resets channel 3.
3.1.3
3.1.4
3.1.5
Bit-15
8XMODE [7:0] (default 0x00)
REGA [7:0] reserved
RESET [7:0] (default 0x00)
Bit-14
Bit-13
TIMERMSB Register
Bit-12
B it-7 B it-6
R s v d
Bit-11
16-Bit Timer/Counter Programmable Registers
B it-7 B it-6 B it-5 B it-4 B it-3 B it-2 B it-1 B it-0
R svd
B it-7 B it-6 B it-5 B it-4 B it-3 B it-2 B it-1 B it-0
Ind ivid ual U A R T C ha nnel 8X C lock M o de E nable
R svd
(default 0x00)
R s v d
Bit-10
Individual UA R T Channel R eset E nable
R svd
R svd
B it-5 B it-4 B it-3 B it-2
R s v d
TIM E R C N TL R egister
Bit-9
R svd R svd C h-3 C h-2 C h-1 C h-0
R svd R svd C h-3 C h-2 C h-1 C h-0
8XM ODE Register
R ES ET R eg ister
Bit-8
R s v d
Table 19
23
S e le c t
C lo c k
HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
Bit-7
R e -trig g e r
S in g le /
for details. As an example, bit-0 =1 resets UART
Bit-6
B it-1
S ta rt/
S to p
Bit-5
TIMERLSB Register
B it-0
E n a b le
Bit-4
IN T
Bit-3
Bit-2
Bit-1
XR16L784
Bit-0