13 PWM & CAPTURE TIMER (T16E)
142
EPSON
S1C17001 TECHNICAL MANUAL
13.2 PWM & Capture Timer Operating Modes
The PWM & capture timer has the following two operating modes:
1. Internal clock mode (Timer counting internal clock)
2. External clock mode (Functions as event counter)
The operating mode is selected using CLKSEL (D3/T16E_CTL register).
∗
CLKSEL
: Input Clock Select Bit in the PWM Timer Control (T16E_CTL) Register (D3/0x5306)
Setting CLKSEL to 0 (default) selects internal clock mode, while setting to 1 selects external clock mode.
Internal clock mode
Internal clock mode uses the prescaler output clock as the count clock.
The count clock is selected by the T16EDF[3:0] (D[3:0]/T16E_CLK register) from the 15 types generated by
the prescaler dividing the PCLK clock into 1/1 to 1/16 K divisions.
∗
T16EDF[3:0]
: Timer Input Clock Select Bits in the PWM Timer Input Clock Select (T16E_CLK) Register
(D[3:0]/0x5308)
Table 13.2.1: Prescaler clock selection
T16EDF[3:0]
Prescaler output clock
T16EDF[3:0]
Prescaler output clock
0xf
Reserved
0x7
PCLK-1/128
0xe
PCLK-1/16384
0x6
PCLK-1/64
0xd
PCLK-1/8192
0x5
PCLK-1/32
0xc
PCLK-1/4096
0x4
PCLK-1/16
0xb
PCLK-1/2048
0x3
PCLK-1/8
0xa
PCLK-1/1024
0x2
PCLK-1/4
0x9
PCLK-1/512
0x1
PCLK-1/2
0x8
PCLK-1/256
0x0
PCLK-1/1
(Default: 0x0)
Note: • The prescaler must run before operating the PWM & capture timer in internal clock mode.
• Make sure the PWM & capture timer count is halted before changing count clock settings.
For detailed information on the prescaler control, see “9 Prescaler (PSC).”
External clock mode
External clock mode uses the clock and pulses input via the P27 (EXCL3) port as a count clock. These inputs
can also be used as an event counter. Timer operations other than the input clock are the same as for internal
clock mode.
To input the EXCL3 clock from the P27 port, P27MUX (D7/P2_PMUX register) must be written as 1 and the
P27 pin function must be changed.
∗
P27MUX
: P27 Port Function Select Bit in the P2 Port Function Select (P2_PMUX) Register
The PWM & capture timer increments counts based on the input signal rising edge.
The PWM & capture timer does not use the prescaler in this mode. If no other peripheral modules are using the
prescaler clock, the prescaler can be stopped to reduce current consumption.
Содержание S1C17001
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