SST89V54RD2 Silicon Storage Technology, Inc., SST89V54RD2 Datasheet - Page 46

• Manufacturer Part Number: SST89V54RD2
• Description: Flashflex51 Mcu
• Manufacturer: Silicon Storage Technology, Inc.

Data Sheet
The table below summarizes various clock inputs at two common frequencies.
TABLE
The four possible CMOD timer modes with and without the overflow interrupt enabled are shown below. This list
assumes that PCA will be left running during idle mode.
TABLE
The CCON register is associated with all PCA timer functions. It contains run control bits and flags for the PCA
timer (CF) and all modules. To run the PCA the CR bit (CCON.6) must be set by software. Clearing the bit, will turn
off PCA. When the PCA counter overflows, the CF (CCON.7) will be set, and an interrupt will be generated if the
ECF bit in the CMOD register is set. The CF bit can only be cleared by software. Each module has its own timer
interrupt or capture interrupt flag (CCF0 for module 0, CCF4 for module 4, etc.). They are set when either a match
or capture occurs. These flags can only be cleared by software. (See “PCA Timer/Counter Control Register
(CCON)” on page 25.)
©2007 Silicon Storage Technology, Inc.
PCA Timer/Counter Mode
Mode 0: f
Mode 1:
Mode 2: Timer 0 Overflows
Timer 0 programmed in:
Mode 3: External Input MAX
PCA Count Pulse Selected
Internal clock, f
Internal clock, f
Timer 0 overflow
External clock at P1.2
1. In Mode 2, the overflow interrupt for Timer 0 does not need to be enabled.
8-bit mode
16-bit mode
8-bit auto-reload
OSC
8-2: PCA Timer/Counter Inputs
8-3: CMOD Values
/12
OSC
OSC
/12
/4
1
Without Interrupt Enabled
46
00H
02H
04H
06H
1 to 255 µsec
SST89V54RD2/RD / SST89V58RD2/RD
0.66 µsec
330 nsec
256 µsec
65 msec
12 MHz
1 µsec
CMOD Value
Clock Increments
With Interrupt Enabled
0.75 to 191 µsec
0.75 µsec
0.50 µsec
FlashFlex MCU
250 nsec
192 µsec
49 µsec
16 MHz
01H
03H
05H
07H
S71255-10-000
T8-2.0 1255
T8-3.0 1255
12/07