XC68HC705B32CFN Freescale Semiconductor, XC68HC705B32CFN Datasheet - Page 72

• Manufacturer Part Number: XC68HC705B32CFN
• Description: IC MCU 2.1MHZ 32K OTP 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of XC68HC705B32CFN

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI
• Peripherals: POR, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Eeprom Size: 256 x 8
• Ram Size: 528 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

5
Freescale
5-14
Note:
Note:
flag and TCMP1,2
1
1) The output compare flag is set at the timer state T11 that follows the comparison match ($F457 in this example).
Compare register
timer clocks
timer clocks
Output compare
Output compare
processor clock
processor clock
Timer overflow
The CPU write to the compare registers may take place at any time, but a compare only occurs at timer state
T01. Thus a four cycle difference may exist between the write to the compare register and the actual compare.
Internal
Internal
The timer overflow flag is set at timer state T11 (transition of counter from $FFFF to $0000). It is cleared
by a read of the timer status register during the internal processor clock high time, followed by a read of the
counter low register.
Internal
counter
register
Internal
counter
Figure 5-4 Timer state timing diagram for output compare
16-bit
16-bit
latch
Figure 5-5 Timer state timing diagram for timer overflow
flag










T00
T01
T10
T11
T00
T01
T10
T11
CPU writes $F457
PROGRAMMABLE TIMER
$FFFF
$F456
(Note 1)
(Note 1)
(Note 2)
$F457
$0000
$F458
$0001
$F457
$F459
$0002
MC68HC05B6
Rev. 4.1