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2000 Microchip Technology Inc.
Advanced Information
DS30475A-page 113
PIC18CXX8
10.0
TIMER0 MODULE
The Timer0 module has the following features:
Software selectable as an 8-bit or 16-bit
timer/counter
Readable and writable
Dedicated 8-bit software programmable prescaler
Clock source selectable to be external or internal
Interrupt on overflow from FFh to 00h in 8-bit
mode and FFFFh to 0000h in 16-bit mode
Edge select for external clock
Register 10-1 shows the Timer0 Control register
(T0CON).
Figure 10-1 shows a simplified block diagram of the
Timer0 module in 8-bit mode and Figure 10-1 shows a
simplified block diagram of the Timer0 module in 16-bit
mode.
The T0CON register is a readable and writable register
that controls all the aspects of Timer0, including the
prescale selection.
REGISTER 10-1:
T0CON REGISTER
Note:
Timer0 is enabled on POR.
R/W-1
TMR0ON
T08BIT
T0CS
T0SE
PSA
T0PS2
T0PS1
T0PS0
bit 7
bit 0
bit 7
TMR0ON: Timer0 On/Off Control bit
1
= Enables Timer0
0
= Stops Timer0
bit 6
T08BIT: Timer0 8-bit/16-bit Control bit
1
= Timer0 is configured as an 8-bit timer/counter
0
= Timer0 is configured as a 16-bit timer/counter
bit 5
T0CS: Timer0 Clock Source Select bit
1
= Transition on T0CKI pin
0
= Internal instruction cycle clock (CLKOUT)
bit 4
T0SE: Timer0 Source Edge Select bit
1
= Increment on high-to-low transition on T0CKI pin
0
= Increment on low-to-high transition on T0CKI pin
bit 3
PSA: Timer0 Prescaler Assignment bit
1
= TImer0 prescaler is NOT assigned. Timer0 clock input bypasses prescaler.
0
= Timer0 prescaler is assigned. Timer0 clock input comes from prescaler output.
bit 2-0
T0PS2:T0PS0: Timer0 Prescaler Select bits
111
= 1:256 prescale value
110
= 1:128 prescale value
101
= 1:64 prescale value
100
= 1:32 prescale value
011
= 1:16 prescale value
010
= 1:8 prescale value
001
= 1:4 prescale value
000
= 1:2 prescale value
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
’1’ = Bit is set
’0’ = Bit is cleared
x = Bit is unknown
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