MC68HC05SR3 Datasheet, PDF (31/96 Pages) Freescale Semiconductor, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller Units

V_OH (volts)
0
1
2
3
0
PB5-PB7 in low current mode
worst case
–1
typical
3
best case
–2
–3
worst case
–4
typical
–5
best case
All ports
Figure 3-5 Typical I_OL vs V_OL @V_DD=3V
3.6
Programmable Pull-Up Devices
Ports B, C, and D have 20KΩ pull-up resistors, which can be connected or disconnected, by
setting appropriate bits in the Port Option Register (at $0A).
3.6.1 Port Option Register
Port Option Register (POPR)
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$0A
PIL PDP PCP PBP PB1 PB0 0000 0000
PIL — PB5:PB7 current drive select
1 (set) – PB5-PB7 are configured to 2mA drive port.
0 (clear) – PB5-PB7 are configured to 10mA drive port.
PDP — Port D Pull-up
1 (set) – The internal 20KΩ pull-up resistors are connected to the inputs of
Port D.
0 (clear) – No pull-up resistor is connected to the inputs of Port D.
MC68HC05SR3
INPUT/OUTPUT PORTS
TPG
Freescale
3-5