xr16v794iv Exar Corporation, xr16v794iv Datasheet - Page 22
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xr16v794iv
Manufacturer Part Number
xr16v794iv
Description
High Performance 2.25v To 3.6v Quad Uart With Fractional
Manufacturer
Exar Corporation
Datasheet
1.XR16V794IV.pdf
(53 pages)
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XR16V794
HIGH PERFORMANCE 2.25V TO 3.6V QUAD UART WITH FRACTIONAL BAUD RATE
The 794 includes a 16-bit general purpose timer/counter. Its clock source may be selected from internal crystal
oscillator or externally on pin TMRCK. The timer can be set to be a single-shot for a one-time event or re-
triggerable for a periodic signal. An interrupt may be generated when the timer times out and will show up as a
Channel 0 interrupt (see
TIMELSB, TIMERMSB]. These registers provide start/stop and re-triggerable or one-shot operation (see
Table 10
alarm.
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. Notice that these registers do not hold the
current counter value when read. Default value is zero (timer disabled) upon powerup and reset.
The bits 3:0 of this register are used to issue commands. The commands are self-clearing, so reading this
register does not show the last written command. Reading this register returns a value of 0x01 when there is a
Timer interrupt pending and 0x00 at all other times.
TIMERCNTL [7:4]
TIMERCNTL [3:0]
3.1.2
3.1.2.1
3.1.2.2
3.1.2.3
Bit-15 Bit-14 Bit-13 Bit-12 Bit-11 Bit-10
below). The time-out output of the Timer can be set to generate an interrupt for system or event
0
General Purpose 16-bit Timer/Counter [TIMERMSB, TIMELSB, TIMER, TIMECNTL] (
X
XX-XX-00-00)
TIMERMSB [7:0] and TIMERLSB [7:0]
TIMER [7:0] Reserved
TIMERCNTL [7:0] Register
TIMERMSB Register
Reserved
These bits are used to invoke a series of commands that control the function of the Timer/Counter.
The commands 1011 to 1111 are reserved.
0001: Enable Timer Interrupt
0010: Disable Timer Interrupt
0011: Select One-shot mode
0100: Select Re-triggerable mode
0101: Select Internal Crystal Oscillator output as clock source for the Timer
0110: Select External Clock source (through TMRCK pin) for the Timer
0111: Reserved
1000: Reserved
1001: Start Timer
1010: Stop Timer
1011: Reset Timer
Table 9
16-Bit Timer/Counter Programmable Registers
). It is controlled through 4 configuration registers [TIMERCNTL, TIMER,
T
ABLE
10: TIMER C
Bit-9 Bit-8
22
ONTROL
Bit-7
C
Bit-6
OMMANDS
Bit-5
TIMERLSB Register
Bit-4
Bit-3
Bit-2
Bit-1 Bit-0
REV. 1.0.0
DEFAULT