NRF9E5 Datasheet, PDF (74/104 Pages) List of Unclassifed Manufacturers – 433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC

PRODUCT SPECIFICATION
nRF9 E5 Single Chip Transceiver with Embedded Microcontroller and ADC
18.8 Timers/Counters
The nRF9E5 includes three timer/counters (Timer 0, Timer 1 and Timer 2). Each
timer/counter can operate as either a timer with a clock rate based on the CPU clock , or
as an event counter clocked by the t0 pin (Timer 0), t1 pin (Timer 1), or the t2 pin
(Timer 2). These pins are alternate function bits of Port 0 and 1 as this : t0 is P0.5, t1 is
P0.6 and t2 is P1.0, for details please see ch. 6.3 on page 15.
Each timer/counter consists of a 16-bit register that is accessible to software as three
SFRs: (Table 61)
Timer 0 - TL0 and TH0
Timer 1 - TL1 and TH1
Timer 2 - TL2 and TH2
18.8.1 Timers 0 and 1
Timers 0 and 1 each operate in four modes, as controlled through the TMOD SFR
(Table 65) and the TCON SFR (Table 66). The four modes are:
- 13-bit timer/counter (mode 0)
- 16-bit timer/counter (mode 1)
- 8-bit counter with auto-reload (mode 2)
- Two 8-bit counters (mode 3, Timer 0 only)
Bit
TMOD.7
TMOD.6
TMOD.5
TMOD.4
TMOD.3
TMOD.2
TMOD.1
TMOD.0
Function
GATE - Timer 1 gate control. When GATE = 1, Timer 1 will clock only when external
interrupt INT1_N = 1 and TR1 (TCON.6) = 1. When GATE = 0, Timer 1 will clock only
when TR1 = 1, regardless of the state of INT1_N.
C/T - Counter/Timer select. When C/T = 0, Timer 1 is clocked by CPU_clk/4 or
CPU_clk/12, depending on the state of T1M (CKCON.4). When C/T = 1, Timer 1 is clocked
by the t1 pin.
M1 - Timer 1 mode select bit 1.
M0 - Timer 1 mode select bit 0, decoded as:
M1 M0 Mode
00 Mode 0 : 13-bit counter
01 Mode 1 : 16-bit counter
10 Mode 2 : 8-bit counter with auto-reload
11 Mode 3 : Two 8-bit counters
GATE - Timer 0 gate control. When GATE = 1, Timer 0 will clock only when external
interrupt INT0_N = 1 and TR0 (TCON.4) = 1. When GATE = 0, Timer 0 will clock only
when TR0 = 1, regardless of the state of INT0_N.
C/T - Counter/Timer select. When C/T = 0, Timer 0 is clocked by CPU_clk/4 or
CPU_clk/12, depending on the state of T0M (CKCON.3). When C/T = 1, Timer 0 is clocked
by the t0 pin.
M1 - Timer 0 mode select bit 1.
M0 - Timer 0 mode select bit 0, decoded as:
M1 M0 Mode
00 Mode 0 : 13-bit counter
01 Mode 1 : 16-bit counter
10 Mode 2 : 8-bit counter with auto-reload
11 Mode 3 : Two 8-bit counters
Table 65 TMOD Register – SFR 0x89.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.1
Page 74 of 104
June 2004