Yes, STC8 microcontrollers have internal pull-up resistors which can be enabled individually. They have a value of 4.1kOhm, lower than many other microcontroller pullup resistors. Due to manufacturing tolerance, the pullup resistor may vary between 3kOhm and 5kOhm.
Source: STC8G1 datasheet, section 9.1.3 (value) & 9.3.5 (tolerances)
STC8 microcontrollers have P5.4 which can (optionally) be used as device reset pin.
STC calls is a low-level reset pin, but in more standard terminology, it is an active-low reset pin
In order to select between using P5.4 as a ~RST pin or just a GPIO port (P5.4), set or unset bit P54RST (bit 4) in the RSTCFG register.
P54RST is unset (binary 0), pin P5.4 can be used as a normal GPIO pin, the RST functionality is disabledP54RST is set (binary 1), pin P5.4 is used as a RST pin. It can’t be used as a normal GPIO pin in this mode
Source: STC8G Datasheet, section 6.3.3+