[LPC1347] Fix PwmOut prescaler for 16-bit timer

[toyowata]

Description

Fix PwmOut prescaler for 16-bit timer on the LPC1347 platform.
See #2660 more detail.

Status

READY

Steps to test or reproduce

#2660 (comment)

Test result

Automated test result

Test summary:
+---------------+---------+-----------+-------------+---------------------------------------+--------------------+---------------+-------+
| Result        | Target  | Toolchain | Test ID     | Test Description                      | Elapsed Time (sec) | Timeout (sec) | Loops |
+---------------+---------+-----------+-------------+---------------------------------------+--------------------+---------------+-------+
| OK            | LPC1347 | ARM       | DTCT_1      | Simple detect test                    |        0.51        |       10      |  1/1  |
| OK            | LPC1347 | ARM       | EXAMPLE_1   | /dev/null                             |        3.5         |       20      |  1/1  |
| OK            | LPC1347 | ARM       | MBED_10     | Hello World                           |        0.39        |       5       |  1/1  |
| OK            | LPC1347 | ARM       | MBED_11     | Ticker Int                            |       11.38        |       15      |  1/1  |
| OK            | LPC1347 | ARM       | MBED_12     | C++                                   |        1.4         |       10      |  1/1  |
| NOT_SUPPORTED | LPC1347 | ARM       | MBED_16     | RTC                                   |         0          |       0       |   -   |
| OK            | LPC1347 | ARM       | MBED_2      | stdio                                 |        0.74        |       20      |  1/1  |
| OK            | LPC1347 | ARM       | MBED_23     | Ticker Int us                         |       11.36        |       15      |  1/1  |
| OK            | LPC1347 | ARM       | MBED_24     | Timeout Int us                        |       11.54        |       15      |  1/1  |
| OK            | LPC1347 | ARM       | MBED_25     | Time us                               |       11.39        |       15      |  1/1  |
| OK            | LPC1347 | ARM       | MBED_26     | Integer constant division             |        1.4         |       20      |  1/1  |
| OK            | LPC1347 | ARM       | MBED_34     | Ticker Two callbacks                  |       11.38        |       15      |  1/1  |
| FAIL          | LPC1347 | ARM       | MBED_37     | Serial NC RX                          |        1.95        |       20      |  0/1  |
| FAIL          | LPC1347 | ARM       | MBED_38     | Serial NC TX                          |        0.93        |       20      |  0/1  |
| OK            | LPC1347 | ARM       | MBED_A1     | Basic                                 |        1.38        |       20      |  1/1  |
| OK            | LPC1347 | ARM       | MBED_A21    | Call function before main (mbed_main) |        1.46        |       20      |  1/1  |
| OK            | LPC1347 | ARM       | MBED_A9     | Serial Echo at 115200                 |        6.36        |       20      |  1/1  |
| OK            | LPC1347 | ARM       | MBED_BUSOUT | BusOut                                |        2.32        |       15      |  1/1  |
+---------------+---------+-----------+-------------+---------------------------------------+--------------------+---------------+-------+
Result: 2 FAIL / 15 OK / 1 NOT_SUPPORTED

Completed in 150.98 sec

Manual test MBED_5 result

Initialize PWM on P0_18 with duty cycle: 0.75
Initialize PWM on P0_9 with duty cycle: 0.50
{{success}}
{{end}}

[sg-]

@mbed-bot: TEST

HOST_OSES=ALL
BUILD_TOOLCHAINS=ALL
TARGETS=ALL

[mbed-bot]

[Build 992]
SUCCESS: Building succeeded and tests were run! Be sure to check the test results