UM10375 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
User manual Rev. 3 — 14 June 2011 274 of 368
NXP Semiconductors
UM10375
Chapter 15: LPC13xx 16-bit timer/counters (CT16B0/1)
15.8.10 External Match Register (TMR16B0EMR and TMR16B1EMR)
The External Match Register provides both control and status of the external match
channels and external match pins CT16B0_MAT[2:0] and CT16B1_MAT[1:0].
If the match outputs are configured as PWM output in the PWMCON registers
(Section 15.8.12
), the function of the external match registers is determined by the PWM
rules (Section 15.8.13 “
Rules for single edge controlled PWM outputs” on page 277).
Table 264. External Match Register (TMR16B0EMR - address 0x4000 C03C and TMR16B1EMR - address
0x4001 003C) bit description
Bit Symbol Value Description Reset
value
0 EM0 External Match 0. This bit reflects the state of output CT16B0_MAT0/CT16B1_MAT0,
whether or not this output is connected to its pin. When a match occurs between the TC
and MR0, this bit can either toggle, go LOW, go HIGH, or do nothing. Bits EMR[5:4]
control the functionality of this output. This bit is driven to the
CT16B0_MAT0/CT16B1_MAT0 pins if the match function is selected in the IOCON
registers (0 = LOW, 1 = HIGH).
0
1 EM1 External Match 1. This bit reflects the state of output CT16B0_MAT1/CT16B1_MAT1,
whether or not this output is connected to its pin. When a match occurs between the TC
and MR1, this bit can either toggle, go LOW, go HIGH, or do nothing. Bits EMR[7:6]
control the functionality of this output. This bit is driven to the
CT16B0_MAT1/CT16B1_MAT1 pins if the match function is selected in the IOCON
registers (0 = LOW, 1 = HIGH).
0
2 EM2 External Match 2. This bit reflects the state of output match channel 2, whether or not
this output is connected to its pin. When a match occurs between the TC and MR2, this
bit can either toggle, go LOW, go HIGH, or do nothing. Bits EMR[9:8] control the
functionality of this output. Note that on counter/timer 0 this match channel is not pinned
out. This bit is driven to the CT16B1_MAT2 pin if the match function is selected in the
IOCON registers (0 = LOW, 1 = HIGH).
0
3 EM3 External Match 3. This bit reflects the state of output of match channel 3. When a match
occurs between the TC and MR3, this bit can either toggle, go LOW, go HIGH, or do
nothing. Bits EMR[11:10] control the functionality of this output. There is no output pin
available for this channel on either of the 16-bit timers.
0
5:4 EMC0 External Match Control 0. Determines the functionality of External Match 0. 00
0x0 Do Nothing.
0x1 Clear the corresponding External Match bit/output to 0 (CT16Bn_MATm pin is LOW if
pinned out).
0x2 Set the corresponding External Match bit/output to 1 (CT16Bn_MATm pin is HIGH if
pinned out).
0x3 Toggle the corresponding External Match bit/output.
7:6 EMC1 External Match Control 1. Determines the functionality of External Match 1. 00
0x0 Do Nothing.
0x1 Clear the corresponding External Match bit/output to 0 (CT16Bn_MATm pin is LOW if
pinned out).
0x2 Set the corresponding External Match bit/output to 1 (CT16Bn_MATm pin is HIGH if
pinned out).
0x3 Toggle the corresponding External Match bit/output.
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