SM8958B Datasheet, PDF (29/49 Pages) SyncMOS Technologies,Inc – 256 bytes SRAM as standard 8052

SM8958B
8-Bit Micro-controller
32KB Flash
& 1KB RAM embedded
7. Timer 2
Timer2 is a 16-bit timer/counter which can operate as either an event timer or an event counter as selected by C/T2
in the special function register T2CON.
Mnemonic Description Dir. Bit 7
TL2
Timer 2 , low
byte
CCh
TH2
Timer 2 , high
byte
CDh
Reload and
RCAP2L capture data low CAh
byte
Reload and
RCAP2H capture data
CBh
high byte
T2MOD Timer 2 Mode
C9h
-
T2CON
Timer 2 Control
Register
C8h
TF2
Bit 6 Bit 5
Timer 2
Bit 4 Bit 3
TL2[7:0]
TH2[7:0]
RCAP2L[7:0]
RCAP2H[7:0]
-
EXF2
-
RCLK
-
TCLK
-
EXEN
2
Bit 2
-
TR2
Bit 1 Bit 0 RST
00h
00h
00h
00h
T2OE DCEN 00h
CP/
C/ T2 _RL2 ^00h
Mnemonic: T2MOD
Address: 98h
7
6
5
4
3
2
1
0 Reset
-
-
-
-
-
-
T2OE DCEN 00H
T2OE: Timer 2 Output Enable bit. It enables Timer 2 overflow rate to toggle P1.0.
DCEN: Down Count Enable bit. When set, this allows Timer 2 to be configured as an up/down
Counter.
Mnemonic: T2CON
Address: 98h
7
6
5
4
3
2
1
0 Reset
CP/
TF2 EXF2 RCLK TCLK EXEN2 TR2 _{C/ T2 RL2} 00H
TF2: Timer 2 overflow flag is set by a Timer 2 overflow and must be cleared by software. TF2
will not be set when either RCLK = 1 or TCLK = 1.
EXF2: Timer 2 external flag is set when either a capture or reload is caused by a negative
transition on T2EX and EXEN2 = 1. When Timer 2 interrupt is enabled, EXF2 = 1 will
cause the CPU to vector to the Timer 2 interrupt routine. EXF2 must be cleared by
software. EXF2 does not cause an interrupt in up/down counter mode (DCEN = 1).
RCLK: Receive clock enable. When set, causes the serial port to use Timer 2 overflow pluses
for it’s receive clock in serial port Modes 1 and 3. RCLK = 0 causes Timer 1 overflows to
be used for the receive clock.
TCLK: Transmit clock enable. When set, causes the serial port to use Timer 2 overflow pulses
for it’s transmit clock in serial port Modes 1 and 3. TCLK = 0 causes Timer 1 overflows to
be used for the transmit clock.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M085
Ver D SM8958B 08/07/2015
- 29 -